That is what Lustrate is for. It's actually kind of a joke between my friends and myself, I don't actually heal very much anymore in dungeons. My time is better spent doing DPS, and leaving the healing to my pet / lustrate unless we pull 5-7 enemies at once, then I dot up, bane, then heal. Even on WP / AK bosses, I don't heal except to succor or pre-shield Everybody's grudge. I've been in dungeons where I have had to hop out of cleric stance twice....Because lustrate is the primary way I heal outside my pet, and it isn't affected by cleric stance.
