So with PvP power no longer increasing healing for DPS specs and damage for healing classes this basically screws over several mechanics some classes have.
Enhancement:
In mop every maelstrom stack increases the healing done of healing surge(?) by 100%. After the nerf, this heal presumably goes down to 25k~ (compared this to feral because idk the raw healing healing surge does without any stacks for enhancement shamans) basically removing a lot of survivability from the enhancement shaman.
WW monks
According to several forum posts on the US forums WW monk selfhealing is also down the gutter. Expel Harm is basically useless now because it does no healing at all and same goes for Chi Wave, which before the nerf did lik 9k per tick.
MW/Fistweaving monks:
Now I'm not 100% sure what the potency of fistweaving was in PvP, but I am pretty damn sure it's gone now. I remember doing 10k blackout kicks on my MW monk versus a mage, in pvp gear. So it could've been like 15k. But now, in 5.1 this will most likely be like 8k.
Disc priests:
In MoP they gave the passive that heals your friendly targets by a percentage of the dmg done by smite/penance and holy fire if I'm correct. This is basically ruined. They nerfed disc priest damage so freaking hard with this change and basically killed the disc priests key purpose.
Holy paladin:
Goodbye shockadins and glyph of harsh wards. What's even the use of these glyphs anymore?
Hotw rdruids:
No need for explanation
Now I KNOW hybrid healing was over the top for some classes. SPECIFICALLY shadow priests. But nobody has ever, in 5.0.5 , complained about the selfheals of a feral druid, enhancement shaman or even retribution paladins. I have seen people complain about WW monk selfheals, which aren't really justified because they're only effective in 1v1 and they have no passive damage mitigation. Besides 15%+ parry chance..
But they shouldn't of completely removed PvP power healing and damage. They should've lowered the effectiveness of PvP power for hybrids if you ask me.
All in all, 25k healing touches are pretty stupid