What about Paladins "Flash of light" if you have enought +heal you can cant 2,5k heals so you have mana "with the proper use of pots" to cast unstopable until the end of the fight.

with the 1,5 sec heal you may be the best healer on the raid so the +heal is not useless

Learn to Dps
Learn to heal
Learn to Tank

and then make comments about the raiding stats who someone needs