If you're typically in a situation where the healer dies in a 4-man group, odds are good that the rest of the party is going down, and your weakened self with low mp will soon follow right after.
In 8-man, that's what the other healer, and potential SMN are for. Reraise is useless in this MMO. It made sense in FFXI when your options were either to have another raiser in the group, or you were boned since most relevant events were instanced (or ten miles away from any town), and home pointing from death removes you from the instance entirely.
