As a healer i barely use Cleric stance outside of soloing. I don't use it at all inside the dungeons simply because if tanks takes critical dmg and I'm in cleric stance that tank is dead. If i dps it is when the tank is stable but i won't use cleric stance to dps. I absolutely hate it when healers use cleric stance and "attempt" to heal my tank. They can not. Even with cleric stance the dps doesn't compare to my blm.