Celoria, Bacon, Lakini, this is for you! I fully support Leafshine and his efforts to undo the lifebloom nerf. The irony of the nerf is that it won't help where it should (reducing PVP/Arena), but will it where it shouldn't (PVE healing).
The nerf reduces the ticks of the lifebloom, but increases the Bloom. Well guess what, in PVP, your opponent does all kinds of things to trigger the Bloom (dispell, purge, etc). When do Druids not let Lifebloom, bloom? In PVE Raiding.