It is hard to keep companions, wolves healed... It would be nice if it were easier...
However, I do agree that as a standalone skill that heal is balanced and good.
I do wish there was an easier way as a cleric to significantly boost followers survivability... Maybe an active aura that simultaneously healed, boosted armor, and all resistances... Make it available through the cleric guild to make it worthwhile to join over the church of the three... Something powerful like this... I don't even think it would be op because you'd be giving up membership to the warriors guild to obtain it.