I just watched a vid this one to be exact
https://www.youtube.com/watch?v=kGVR4DqAqKI the guy is explaining his non blanket atonement rotation in preference of shadow mend and shield to get atonement buffs out and although his burst healing is much lower his overall healing is still quite good considering he got ranked in logged US kills.
I will be personally switching from a raid healer to a spot healer mentality in our next raid, as other then the mana issues I simply felt that too much of my gcd's was spent on spells that did next to no healing and the raid it's self suffered from my over use of those spells, i.e plea and Radiance.