I wouldn’t use Healing Touch that much in a 5-player dungeon. It’s slow and expensive and heals for a lot, and you really don’t want to be overhealing a lot in Cataclysm. Maybe if the tank has been whittled down and you just can’t catch up, you could throw it out there. For the most part, I would use Rejuv and Nourish to heal the group and Lifebloom and Nourish to heal the tank, throwing out Swiftmend or Regrowth for emergencies.

We want Wild Growth (and Circle of Healing) to be really good spells, but it’s hard to keep them in that niche without them just being used every time they are off cooldown. High mana costs are supposed to make you ask yourself: Am I hitting Wild Growth to heal 2 people just because it’s an easy / lazy thing to do?

The limit-one Lifebloom is our attempt to make the spell a really useful tank-healing tool again. It’s just too easy to keep an instant spell up on lots of targets, yet this is one case where we don’t want the mana cost to be excessive. We also have a mechanic to let a stack of Lifebloom be refreshed by Nourish — without this mechanic, druids just don’t have the GCDs to do much more than keep hots up on tank and avoid any spell with a cast time. But if you could keep stacks on multiple targets so easily, druid would be too powerful at healing.

We know making this change to Lifebloom will have PvP ramifications, but we’re also okay with that. We need to shift PvP healing (for everyone) back towards cast time spells. When PvP healing is balanced around heals that can’t be interrupted and can be cast on the move, then we have to do crazy things to give your opponents any chance to counter them. Resto druids have had a storied history of being overpowered or underpowered in PvP and we want to avoid these extremes. You’ll still be casting hots, but you’ll be casting non-hots as well.

It’s all early in development though and we haven’t done a lot of PvP balance testing yet, so this design will evolve over time. Resto druids have a lot of spells, some of which have very subtle niches. Our initial strategy is to try and find homes for them all, because we like the spells. But if we can’t make it work, we’ll start cutting some. (Source)