All you're doing is proving to the masses that tanks are !@#$%^-s as a group, not all of them, but the majority. Whoopity freaking doo if dmg based healers do more dps than you, doesn't it make you happy that there are 5 people in a 5-man doing great dps that way everything dies and isn't hard so that you level faster?
See, what I truly think is happening here is that finally having a class/spec/role outdoing low level dungeons has somehow hurt your ego when no one cares about low level dungeons. Deal with it or don't do them, obviously if you truly have been playing that long Blizzard has never cared about low level crap and neither should you.
By the way, you're quite possibly the only tank that cares. I've had more than few actually thank me for being able to do that and heal, GOTTA LOVE ATONEMENT RIGHT?
Out of everything that is going on right now, why is it that healers, specifically healers that aren't retarded and can keep everyone alive and contribute to killing things making dungeons go faster, that bothers you so much so that you make time out of your so important chain tanking?