Nerf my life bloom?? NOOOOOOOO!
Generally when im healing, I put rejuve, stack my lifebloom 3x on tank, use the 5 seconds grace to thro hots on party members if needed, hit lifebloom on tank, rinse and repeat.
I never run out of mana in 5 mans, normal or heroic, and rarely have to cast regrowth (uber mana burner for actually a small return), if tank dips low, I let the lifebloom bloom, and restack.
In Raids, again, I will keep rejuv and lifebloom up, sometimes regrowth too (specially in fights like gruuls where there is silences, and hateful blows).
Most laugh when They find I'm in all purples, and have barely +1580 healing unbuffed, but cry when they see me top the Healing Charts. (I may have to concentrate on more + healing if they change lifebloom tho)
With the 2 of set proc from t4, and an 11k mana pool to begin with, and my mp5, using the mp5 trinket i have, and the LC prayer book (my one and only beloved blue) I rarely have to use my innervate on myself.