I've long been a staunch defender of you, heal-bomb.
I have held on to you and your friend, my dear sweet Divine Fury... from the 80 levels spent Holy as I quested and killed mobs, all the way to 10 man ICC. All the way through to Festergut...
Where my love for you wiped our group.
We have a very strict 11pm cut off time. We were stretching it for a couple of minutes to try and do a quickie Festergut to close out the night. Final inhale, and my eyes are squinted, my shoulders tense, as I weave my way through a very strict tank healing rotation. Tank is at full health, so I decide that at my next Borrowed Time buff, I'm going to squeeze you, Greater Heal, into my rotation. Raid buffed, even without Borrowed Time, I've got 35% haste. The cast time on you with Borrowed Time is approximately 1.6 seconds.
And you just weren't fast enough.
I don't know how much mitigation value was on the tank at the time. Pain Suppression had probably worn off, and during your precious 1.6 second cast, I'm sure any bubble (Power Word: Shield or Divine Aegis) he'd had was gone. But nothing makes me angrier than having my heal land a microsecond after the tank dies.
I'm livid. And I may be abandoning you from here on out, Greater Heal.
Granted, that was definitely not the best situation in which to use you, and I fully recognize that. But when my eyes are squinted and my shoulders hunched, sometimes my snap decisions aren't the best. It's the analysis I do afterwards that makes me a better healer.
Here's the thing. You're very powerful, Greater Heal, and I certainly can't deny that. You heal for somewhere between 11k and 17k, depending on whether or not you crit, stacks of Grace, etc. You're great for filling up the tank when he or she takes a big hit. So in general, to be effective, I prefer to use you when the tank is low on health (or when I expect him to be low on health by the time the heal hits). That generally means they are going to be below 50% health... which is where your arch enemy, Improved Flash Heal, kicks in. That extra bonus to crit means I have a 10% higher chance to proc that yummy Divine Aegis on the tank.
I was already planning on dumping you, Greater Heal, once I picked up the two piece t10 bonus but it looks like I may have to abandon you sooner. You may be more mana efficient... but I just can't rely on you. You just aren't dependable. You weren't there when I needed you, GHeal. How much crit have I sacrificed in your name? Five talents points that could make me a stronger, more independent Dwarf... and I have given them to help you be a Better Heal.