I play in a 10man raid, of whom is currently working through Amber Shaper. Everything prior to this is on farm, and pretty much everything can be 2-healed by us other than maybe Heroic Stone Gaurd (we're 1/16HM) and Wind Lord. Amber Shaper, we're already leaning towards 2-healing, since our bigger problem seems to be with bursting out teammates our of constructs without drinking pools.
Being a druid who can play both resto and boom, I'm the one that flops between DPS and Heals. To date, I've primarily been gemming and enchanting for resto. When it comes to going DPS, other than swapping on a few boomkin-specific pieces, I just reforge before the pull.
Being gemmed inefficiently aside, the additional of the valor upgrade gear will exacerbate the problem some more. Now, to be clear - the inefficiency is significant but not devastating, and I'm not complaining. This is merely an intro.
TLDR; I play resto primarily, then play boomkin on 2-heal fights. Farm content can be 2 healed, and many progression bosses seem to benefit from 2-healing. No content thus far seems as though it requires 3 optimized healers, but can survive with 2 optimized healers and 1 slightly unoptimized healer.
My question is, how are you 3rd wheel healers (so to speak) going about this? I'm half-way considering I should be gemming/upgrading for boomkin, leaving my resto set less efficiently tailored. I'm curious whether I'm the only one who feels this way, or if you think I'm nuts.