When doing big pulls, I use my buffs only when I see my HP drop too much fast. On old content, I almost forget I have buffs because everyone can dps and hp is not a problem.

On new content, healers must heal and tank must mitigate. That nonsense of dps healers must go to a stop and new content got to that direction. I'd expect newer content keep healer and tank much busier on their role than now.

If an healer loves so much doing dps, better s/he play directly a dps job, because IMHO s/he playing healer more for the short DF queue than the willing to heal.