Originally Posted by Sarvius
Healing surge is the same (roughly) HPS as GHW but is dramatically lower HPM. So no, the situation cannot simply be dealt with by healing surge. Unless you're only defining "dealt with" as having no one die rather than playing as optimally as possible. When that situation arises (as you said, it usually shouldn't), use NS. If it's on cooldown use a healing surge but, barring extreme circumstances, healing surge should never really be cast. The same is true for every other healing class - except for druid/priest clearcast procs. Fast heals are not meant for PVE, they're abysmal hpm. Spamming them is an old habit that should be broken as soon as possible or you won't be able to contribute very well in raids.
That said, if you can find a useful place to put the point and you feel like you never use it, more power to you. NS is certainly not a required talent. I don't advise passing it up, but it's a judgement call.
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Personally I think this is not very good advice and I want to dig this back up briefly to discuss why.
You should never really cast HS or GHW without tidal waves up. So this analysis assumes that TW is up.
For my last 5 man, which is the only thing I currently have a log for, my average HS was 17627 with 43% crit. My crit for the run was 20%, so I obviously cast a few HS without TW. As you'll see if I had used them with TW it would have made HS even better than GHW. My average GHW hits for 19000.
Even though HS only procs improved water shield at 60%, I have a (0.43) * (0.6) = 25.8% chance to proc. I have a 20% chance with GHW. Right away I'm gaining more mana by casting healing surge. When you take this into account, the HPM for the two spells become:
GHW: 3.03 HPM
HS: 3.21 HPM
Not a huge difference, but good enough to keep me away from GHW. HS is also considerably more HPS with the crit buff.
Not including the global cooldown:
GHW: 19000 / 1.6 s ~ 11900 HPS
HS: 17600 / 1.3 s ~ 13500 HPS
Without going into a ton of detail, the simple answer is, healing surge outperforms in both HPM and HPS. If you have numbers to the contrary I'd love to see them, because I've been healing without GHW at all for most of cata.
Maybe tomorrow, after patch day, this conversation will change. But the numbers I've seen in the other thread here seem to indicate that GHW will simply come closer to HS, but not surpass it, so that the usage of either spell becomes more situational, i.e. you use GHW when you don't want to rely on a crit.