if you are dying to a warrior, get some better gear. I smash priests with poor gear. I die to priests with good gear. Don't use a heal when they have taste for blood up, cos they will OP your ass and get 75% healing reduction on you. Keep PW:S and renew up 100% so you don't have to heal that much, and cancel penance 1s early (just get 2 ticks) to reduce chance of an OP in your face.
put SW:P and DP on them, and just watch their life tick away. a few random SW
/ mindblast doesn't hurt either.
oh and as always against a warrior, just 5-8yrd kite them. they cant hit you, and can't charge you.
but, from warrior PoV :
I love, undergeared healers of any spec
I love killing resto druids and holy paladins, because they think they can't die, and when I 3 shot them, I just imagine them nerdraging hard.
I hate overgeared disc priests and holy paladins, because they kill me
I hate overgeared resto druids and resto shamans because I can't kill them, and it's a 45 minute fight (they usually randomly root/stun me, giving me HP back)