I get a lot of questions from newer raid healers on spell rotations so here is something I wrote for our guild website that I thought might be of interest for the newer healers in the crowd.
Here is a link to my regrowth/rejuv Raid healing build.
Druid Talents WoW Armory Light[url]
Rather than my walking thru all the talents just ask me if u have any questions.
Maj Glyphs - Regrowth, Swiftmend, Wildgrowth
Min Glyphs - any
Until you are in 226/245 gear gem all spellpower except what you need to activate your meta. Once your in higher level gear start subbing out some haste for spellpower unless you have mana problems.
With this build the main spell focus is on spamming Regrowths/Rejuvs.
In a fight with all tank damage over a short duration, ie Hall trash VOA, my spell sequence is Rejuv+Regrowth+Tribloom. My priority is then keeping the tribloom rolling at all times, refreshing Rejuv & Regrowth as their timers run low and casting Nourish in any spare time. If a dps takes a bit of splash dmg I sub a Wild Growth into the rotation instead of Nourish. My oh-shit lvl 1 is a Swiftmend and my oh-shit lvl 2 is Natures Swiftness + Healing Touch (NEVER cast HT except in conjunction with NS using this build)
In a fight with all tank damage that is going to last longer, ie phase 1 Ony. It as above except either let the triblooms bloom then restack or don't use the triblooms at all and stick to nourish with a more liberal use of Swiftmend. This is a gear call, if u typically have mana problems don't use the three lifeblooms, just mash Nourish while making sure Rejuv and Regrowth stay up at all times.
Okay meat and potatoes time, raid heals. All fights are a little different in when and how the damage arrives but the general philosophy is the same. I cast regrowths on all the tanks just b4 the pull. While running in with the tanks I cast a Rejuv and stack a tribloom on the main tank(all instants can be cast while running), once I stop I refresh the regrowth on the main tank. If the raid is not taking damage yet I then either continue to heal the tanks or if the tank healers have that under control I then cast Regrowths on all the healers and any dps with a history of pulling aggro. As a raid healer u need to know who the top dps are as they need to be kept alive as a priority - but it's not a bad idea to let them die every now and again as a reminder not to pull off the tanks So at this point the raid starts to take damage, in 10 mans, I keep a regrowth rolling on every raid member use wildgrowth on cool down and use my two oh-shit moves as needed. In 25 man's where the raid is generally speaking above half health I spam regrowths and use wildgrowth on cooldown. My priority is ME, the high dps, then the healers, then the tanks, then the low dps. In 25 man's where the raid is all below half health, eg tantrum, I spam rejuvs(shorter cast time) and use wildgrowth on cd. Once we've made it up over the 50% mark I switch back to regrowths. Use Swiftmend on every CD, don't save it, it's too good of a spell not to use on every CD. With Nature's Switness + Healing Touch I only use is on a tank, the top 3 healers or if some1 is rebirthed in the middle of a fight. It's a raid saver and you want to keep it off of CD for when u really need it.
Golden Rule in ALL of the above - HEAL YOURSELF FIRST Most common new healer problem is them dieing, always have a regrowth going on yourself so you have a switmend option instantly available.
A note on Innervate. I deliberatly don't stack too much haste to keep a balance on my mana pool versus my heals-per-second. This means that except on the longest fights I usually have spare innervate's available so my focus is on Pally tanks, then healers, then high dps as to who i innervate. In raids tanks rarely need mana, in 5 mans they need it all the time. Newer healers and high dps will often need mana, help them out.
A note on Healbot. Set up healbot so you can see spell icons and timers. This is the only way to keep regrowth, rejuvs and triblooms rolling at all times. Display a 3 bar wide mana and aggro bar. Seeing who just pulled aggro b4 the damage arrives let's you proactively cast which on a clothy can be a lifesaver. The mana bars let you track healers mana so you know when/if you may need to cover other healing assignments as well as know who may need your innervate. Setup monitoring for curse and poison using different colors, define custom buffs for things like Incinerate Flesh and Fire Pot in a third color this saves you having to read who got hit and find them in the raid frames, again usually a lifesaver DO THIS NOW Make sure you have a five button mouse u need it as a druid healer. After lots of playing I have RG,RJ,WG and NS mapped in that order on the left click. I have LB, SW, N and HT on right click. Brez + Rez on middle. Poison button 4 and Curse button 5. NS+HT are both on alt so you can left/right click fast just holding the alt key down
Note on Addons. Healbot is the only add-on u "must have", other than the guild required DBM, EPGP and EPGP lootmaster. As the raid heal leader I also run OMNICC which lets me see cool down timers on every1s brezs and Surgeon General which lets me manage healing assigments. I don't bother with Omen as my healbot let's me see who has aggro.