The common adage in Pathfinder is that healing only slows you down, and a dead orc does no damage. I hope they can achieve this sort of balance with next. A healer should never be mandatory and people should have freedom to play any class they like.
Eh... a healer is still pretty much required in Pathfinder. Or at least plenty of healing magic for after the fight.
Not to mention debuffs are basically pro-active healing- and a lot more fun.
Damage reduction, temporary hp, buffs and debuffs can all substitute for healing in all but 1 way. They can't undo a huge amount of damage.
Still, I think most cleric spells should have healing or a healing substitute as part of it, as long as it can be done in a thematically appropriate way.