I don't know if it's just my guild's MWers that are awesome while the other healers suck, but me and the other MW absolutely cleaned shop on the HPS in Normal NH last night.
We went in with about 30 people and 6 healers (2 MWers, 2 Paladins, 1 Dru and 1 Shaman), the 2 MW easily topped the HPS on EVERY fight. All 10 fights. And it wasn't even close.
I'm guessing a lot of this has to do with scaling. MWers scale very well with raid numbers and 30 people is a lot of people for Revive and Chi Burst to heal. I also noticed that most fights had people scattered which made it very inefficient for stacking heals like Healing Rain and the Druid circle one and very good for heals like EF and ReM. Also, being Normal, mana wasn't that much of an issue, so we were basically allowed to go all out without having to worry too much about going OOM. I only had to pop mana pots on 2 or 3 of the fights.
The Paladins and Shaman did maybe half of the healing we did and the Druid came in close at about 2/3.
Edit: Also forgot to mention that a lot of the fight made use of our superior mobility. Transcendence was actually very useful for a lot of the fights. Especially Elisonde where I can completely cheeze that enclosing aoe thing by just teleporting outside of it.