I thought I would start up a nostalgic thread for the past and pose this question. Of all the healing specs from Vanilla wow to the present, who could have been swarmed with the most players and live the longest?
Personally I've only healed as a holy paladin, but back in Wotlk I think there was a thing where paladins could spec primarily in Protection as a healer. The result would be that they didn't have an instant cast heals, but could easily survive being interrupted a few times. They lacked healing power, but in terms of self healing they didn't really need it.