Myself and my guildies are far from pleased about the nerf.
We have been stuck on 3/8 HM for weeks due to not being able to find a decent 3rd healer and 1 dps.
This is our hinder not the difficulty of the mechanics which isnt that hard on Heroic Zon and Hag.

The nerf is a shame regardless if it can be toggled off and on. But its happening and thats how it goes once again.