This post could have been a lot more to the point. You have some valid things to say about your experiences and impressions from healing level 85 raids. However you surround those things with feelings rather than calculations, and the math that you did do, you didn't show.
I have been racking my brain thinking about how to develop new stat priorities for level 85 and I can't really figure out a good way to model it.
From my gut, having done testing as resto on almost every raid boss they have made available so far, and killed them, it feels like mastery and spirit will likely be our best stats at least on the onset.
I have been considering trying to hack shaman_hep to work with the new numbers.
The only good way I can think to model deep healing is to parse an actual combat log and record something along the lines of "what percentage of health was the target at when they received the shamans heal", and calculating it based off of that. Doing that in an addon would be cool to have a recount-like display which could show you the benefit of deep healing in real time; but what I would really be interested in is a way to have a script like shaman_hep model it so that we could develop some semblance of HEP values and stat priorities for level 85.
Another way I could see it being done is to calculate an average raid members health over the course of an encounter, and use that number as a figure to calculate against.
After trying to hash out some numbers for a few hours, I didn't really get anywhere.
What I do know is, the new haste cap, raid buffed, is going to be somewhere around 5500 haste rating, which would probably be impossible to achieve below item level 500 (based off some napkin math), so clearly stacking haste is not the direction blizzard wants us to go.