Druids are in an uproar over changes that are coming to the Lifebloom spell. Koraa from Blizzard responded to the complaints in the post below.
Yes, we have done some toning down of Lifebloom. Lifebloom was unintentionally buffed too much during Burning Crusade when we made the coefficient scaling work on the stack applications. This has caused a lot of problems with balance in the game. Druids are intended -- as healers -- to be able to dish out good throughput heals with very low efficiency, likewise Lifebloom is intended to be rather cheap and efficient, but not to the degree that it is today.
Compare how you healed in dungeons and raids pre-Burning Crusade to today. Before you used nearly every healing spell you had, today you just use Lifebloom and maybe your other HoTs just because they stack with Lifebloom. Not only is this boring to the player, but it pigeon holes the Druid to spamming Lifebloom on the tanks.
We hope to tone down Lifebloom and bring the Druids other healing spells up to speed in this expansion. Part of this is through changes to the Druid class, changes to other healing classes and through encounter design.
Just as a note -- we did intend to change Lifebloom in the Burning Crusade (lower the coefficent), but we ended up delaying that so that we wouldn't hurt the Druids viability in raiding. With Wrath, we're introducing a new heal, a revamped Tree Form, and other mechanics to correctly balance things out.
You can read all the comments and post yours in the official forums here.