If you're doing a PUG heroic and you land a priest healer, vote kick them. It's worth waiting 15 minutes at this point.
If you're running in a guild heroic group, using vent, and you have great players behind the characters you'll be able to do heroics. You've got to work your ass off, but with perfect execution from the rest of the group (CC, don't stand in fire) you'll get 50/50 odds on beating bosses under geared. (Holy build, Chakra: heal, serenity, renew, LIGHT WELL, shadow pet, hymn of hope, mana pot, divine hymn, and get used to having the group below 40% health for the majority of the fight. If DPS is lacking, use soul stone or battle rez to regain an additional 10-20% mana. Some boss fights require this extra suicide tactic. Light Well at the start and end of the boss fight (scratch up the mana, have the tank blow cool downs)
TBH, if you're running with a guild group be thankful they're letting you be selfish and play a broken class.
TL/DR: votekick priests in heroic PUGS, guild groups w/ vent are doable.