Not sure about shortest, but absurdly strong due to the fact it's a ranged interupt that follow melee interupt rules (no blanket silence, short cd, facing requirements as far as I remember).
@OP
Chainheal was never OP as ele, and tbh I don't think it was even used after... lvl 80 zul aman?... as elemental.
Bandaid totem was bad from the beginning and it was a higher dps gain for resto than it was for the dps specs (obviously), plus it was an excuse for shit scaling. (Why does shaman need bandaid totem for all specs and vigor for resto, both being unique buffs? Yes, rhetorical question
)