Word of Glory doesn't need to be ramped up at all though. You can use it at any amount of HP and it will heal exactly the same (in terms of health per HP).
In PvP it's actually far, far better to use WoG at 1HP, due to Protector of the Innocent. Waiting for multiple stacks of HP to use Glory is just wasting potential healing.
Selfless Healer is "fine". It's supposed to cost you DPS to use. The little damage boost attached to it is just so you don't feel like an utter wank healing someone else with it.
I honestly hate Selfless Healer. It's just too good to pass up for PvP at the moment.
more beneficial if we got the damage buff when we heal ourselves too.
Are we talking PvP or PvE here? Cause it seems to me every spec has roughly the same number of HP consuming abilities.
All three have Word of Glory, and all three can get quite a bit of use out of it, though ret far less than prot or holy. Ret should never be using WoG for PvE content anyway.
DS really shouldn't count, it's mutually exclusive with TV and kinda terrible to boot, and doesn't interact with HP at all on beta (and is even worse).
Zealotry consuming HP is absolutely stupid, but hey that's being fixed.
Practically speaking, each spec will (in the end) only have two finishers they care about.
Holy has Word of Glory and Light of Dawn.
Prot has Word of Glory and Shield of the Righteous, though will also need to use Inquisition for AoE
Ret will have Inquisition and TV for PvE content, drop Inquisition for WoG for PvP.