If my group decides to farm Titania for the mount, I should not be dreading the coming boredom.

This is the problem with healers. With DPS and tanks, going to content you overgear and overskill does not feel as bad as doing so on healers, and this lies entirely on the dps kits each role has.

I suppose healers can gimp themselves, but then there is a conflict between having fun and being optimal, which is a design failure.