Here's pretty much my situation. I did Heroic ToC (the new 5 man) yesterday with roughly 1800 spellpower in tree form. I did it with a warrior tank, and he had around 34k hp. Not sure on the rest of his stats. Basically, he took damage like a pro. A rejuv was enough to keep him up through the 2nd boss trash pulls, with a lifebloom thrown in every once and a while out of boredom. Which was great, I had GCD's to actually heal other people. Everything was one-shot.
On the dark knight P1, I kept him up with Rejuv/regrow/chain blooming lifebloom one at a time. On phase two, all that was required over this was a 3stack of lifebloom and maybe four nourishes the whole phase. Phase three is always a ***** simply because of the random splash damage. Ended the fight not having to use innervate.
I did it again today, another warrior tank with about 35k hp. He took damage like the little ***** that he was. I had 2k spellpower at this point (overnight naxx 10 ftw), and I was having a hell of a time keeping him up. Trash required full hots, bosses required hots and nourish spam until I was ready to blow a gasket. Wiped a few times because he left a mob beating on me so with pushback I couldn't heal him properly.
On dark knight P1, it was Wild Growth/Rejuv/Regrow/Lifebloomx3 and nourish spam to keep him up just through that. On Phase 2.. we wiped about five times because I can't keep him, myself and 3 dps up when adds are OMG EVERYWHERE assraping three ranged that are too spread out for wild growth. Finally we beat it by stacking up and both druids hitting tranquility, lol. I went through two innervates and a runed mana pot and was still oom by the end of the fight, almost lost the tank to being oom but they killed him.
So what gives? Gain 200 spellpower and 30 mp5 and suddenly heroics are hard? o_o the second one had plenty of ulduar gear, just like the first one. I am a confused, angry druid. =(