The rotation for Resto Druids is broken and overall very odd at the current state. Even Elitist Jerks are very confused about the whole situation. But yeah, healing in Cataclysm pretty much forces everyone not to take extra damage since healers are having big problems healing everyone at a constant rate.
I always throw Reju and x3 LB on the tank while spamming Nourish on him. I noticed that if you throw Nourish when LB's got a second left, it won't refresh which is a really frustrating bug. This should be fixed.
If tank's getting hammered, I do Reju, SM, x3 LB, Nourish. If that's not enough, I usually time my Healing Touch so that it heals him for the amount of health he needs (you shouldn't overheal in Cata, we can't afford that at the current state).
Always use Healing Touch when Omen of Clarity procs. Regrowth heals nowhere near HT, even if it crits (let alone if HT crits, which is a fucking beast).
Regrowth is extremely broken, in a bad way. I still haven't found a good way of using this except for situations like "Oh shit, this guy is one second from dying, fast heal inc!". And even then, it feels as if Reju + SM would seem like a better thing to use, if you've put point into Swift Rejuvenation.
Wild Growth sucks. In fact, that whole part of the talent tree sucks IMO. 6k mana for something that heals so little % to party members seems like such a waste. I'd rather prefer people standing in my SM AoE while I Reju everyone up (much more efficient).
Tree form is situational and yet I've never found a good place to use it. I currently hate it at the current state. Instant Regrowth? Yay, OoM in less than 8 seconds. LB procs on another member? Who the hell cares, LB alone doesn't save your party. Wrath/Roots? LAWL. Come the fuck on.