Lurker if you're in a group with a shadow priest is extremely easy. I only jump out of the water when killing adds. During the dps on boss I just float on the surface of the water and nuke the boss non stop, going as full out as I can with my dps. Here is my wws from him last night where I got 1038 dps.
Wow Web Stats
I don't even see why one has to go underwater at all. I've found when I tried it I wasn't able to hit the boss well due to the platform being in the way.
I think the biggest key to maximizing dps and presence time is to know your movement plans beforehand. If you know there is times you need to move, try to drop totems on the run. Karathress this is huge for. Also since the first add probably won't take 2 minutes, try to have your totems down before the fight starts. The point is if you're moving you should be redropping totems.
General keys for fights I've seen: (and this is assuming you're with a SP/Mage group)
Hydross - This fight sucks, just don't pull agro.
Lurker - Stay in the water, only jump out to kill adds. Refresh totems during add phase, not boss phase.
Leo - Refresh totems during WW time, Nuke as heavily as possible when not in WW. Save heroism for 15%
Karathress - Pre drop totems, drop totems when moving. Use CL on spitfire totems and as much as possible on hunter. You'll hit Tidalvess and Karathress as well as the pet. Pre drink a mana pot before hunter even if mana overall is good because 1-2 stings can kill you. Use heroism on Tidalvess (we do him first, if your fight is slow it might come up again for Karathress) (edit: oops 10 minute enrage, nix that idea!)
Morogrim - Shoot a CL every time into the aoe pit after Pallies have called for it. It's a bit of a damage boost, but the main issue is Morogrim threat is a problem if you stay on him nuking non stop depending on tank/tombs. Another possible fight if dps is slow that you could use 2 heroisms. Don't use it before first aoe group though, unless your tank is godly you will pass him in threat.
Vashj - Drop totems when running in, Vashj should be in P2 by time to refresh comes. Recall totems there and redrop mana spring immediately and the others either now if not an issue or before first naga comes out if mana is. I'm on strider dps here, use downranked Frost Shock to help the kiter out. Position yourself near the edge of the inner circle so as the Strider gets kited in an arc you don't have to reposition so much. If agro with strider (we have a hunter kite) is an issue, shoot a couple LBs into nagas and help them out. Make sure to redrop totems between striders. On P3 use heroism. While its possible here that you could use heroism in P1 and have it come up again in P3, I wouldn't bother. Getting a heroism off right when P3 starts I find is best. Try to get her down below 20% fast.
Al'ar - There are 4 positions for P1. Any adjacent positions are nukable from one spot. This means for me 1&2 and 3&4 are where I stand between. This means no need to redrop totems or to move positions between those positions. Drop totems only when on the run between those spots. When Al'ar goes up to quill its possible to get an extra LB or two in. Definitely a good fight to predrop totems.
On P2 redrop totems during the time where Al'ar is in the air but untargetable. When he goes up in the air he can be targetted and you can get in 2-3 more LBs/CL during that time. Use heroism just after he lands, probably second time in P2.
Void Reaver - Don't run out, strafe. Keep aware of who is around you. Redrop totems when strafing. Possibly keep Tranquil Air down for the first minute or so, then switch to Wrath. Use heroism early, its possible if your dps is slow it might come up again, although by that time your threat will be killing you, plus the enrage killing you too. :p
Solarian - Another sucky fight. Redrop totems when she dissapears. Can use similar CL strat from Morogrim. Otherwise just single target nuking with very little to min/max.
Kael - There are a lot of things you "can" do to maximize DPS during P1. Don't. It's not worth it. Let the melee, hunters and locks who are spending less mana take more of the load there. Due to LO and TLC are damage/threat is pretty spikey. No point in padding your dps during a meaningless phase. (Of course I do pad on Solarian, but thats because that fight is retarded and on Morogrim cause threat can be an issue if you don't get graved) I predrop totems and then redrop them when Sanguinar comes in a spot thats useful for Cap. I then recall them and only redrop at end of P1 near AoE pit.
P2, maybe use Tranquil Air if agro is sketchy for you and mages. We have our axe tanked by a feral, so threat isn't an issue there. Thing is if you focus on one target with your spells, you probably will pull agro. Thus my first 1-2 Lbs are on the Axe. After this tab targetting is key here. CL every time it is up. Heroism use is debatable here. It helps you on the adds, but likely not the mages. However using it here means it comes up in P4. If you leave heroism til P3 and use it there, you won't have it til the fight is basically won in P5.
P3 reposition when you're chasing Theladred and dps him when you can. You can decide on your own whether its worth it to recast them at the back of the room when you kill Capernian. Totem dropping in P4 is always done when on the move. Make sure to note position of phoenixes at all times. If you're moving from a Flamestrike, move towards the phoenix tank position. Shaman dps is all about minimizing wasted movement. Try to save EM for shock barriers. If you have 2 piece T5, getting a free heal out can be handy. Good tossup question on barriers whether to use shocks to get it down. If you can get it down to interrupt the second, great. If you shock and don't have it to interrupt the third, pray your raid leader doesn't go medieval on your ass if no one else interrupts.
MH Trash - Treat it like Kael weapons, tab target. If you stay on one target, you will pull agro for sure.
Rage Winterchill - Find a spot not too close to other people, Hover your hand over your pvp trinket, be ready to strafe, otherwise you should never move unless you get hit by DnD.
Anetheron - If your tank for infernals does it in a specific postion, go to a spot that can hit both there and the boss. This is another fight where you won't move unless you get infernalled so just redrop totems as best you can.
Kaz'rogal - Use heroic badge totem. I use demonic runes, super mana pots and drums of restoration on this fight. Only use CL when EM is up. Otherwise just chain cast LB. A very good fight to predrop totems. If you have 1:30 left on them when fight starts you'll probably only get the chance to recast once. If you have some higher crit choices (like Sextant) probably a nice place to use it. You shouldn't be moving the whole fight anyway. (funny enough in 3 kills only once have I ran out of mana on it, and that was right when he died, all the while priests, paladins, mages around me are blowing up)
Azgalor - Really depends on your raid's strategy. RoF and Doom are such big variables they're hard to plan for. Probably best to heroism right after someone else gets doomed so you get full benefit. Redrop totems when moving from RoF.
Archimonde - Not killed this guy yet, just attempts. So much running time that mana, threat, and redropping totems are not an issue. This fight is a little like curator, you have very limited dps time on the boss. Do the most with it.
Naj'entus - Stand in place, nuke nuke nuke. Predrop totems. Really no strategy you can do here to maximize presence.
Supremus - This is a fight that you can do a bit with. Its one of the few fights I can reliably get 2 heroisms off in. I use mine like 5 seconds after the pull. Don't be stupid during kiting phase, but you can treat this like Strider dps in ways. If you get a chance that he's running across your screen, you can unload some major dps into him. Tons of time running to redrop totems.
Akama - I'm on channelers, I just try to wait til they clump and CL them. On the boss I use heroism about 10 seconds into him, as the poison stacks on him your dps will do more. Use all cooldowns there.
And thats about the extent of my PVE progression atm.
But I think the 3 main things are:
1) Minimizing time wasted redropping totems. Fights with movement is a boon here obviously. Drop totems when on the run.
2) Know where your path of movement lies. Extra movement is wasted DPS time.
3) Know when to use CL to get multiple targets hit.