I’ve been playing Resto in battlegrounds. I think I understand part of what you’re saying. Paladins and Shamans both have to hard cast everything. Healing Surge and Flash of Light feel very similar. Still, if we go back to the original class identity, Shamans and Paladins are supposed to be pretty similar. Paladins were supposed to be more defensively oriented and Shamans offensively, which is why we have Purge.
Aside from a few complaints which I posted on the WoW forums: http://us.battle.net/forums/en/wow/topic/20748875675, I’m reasonably happy with how Resto plays in PVP. If I finish my math homework early tonight, I’m going to queue for skirmishes and see how it feels in Arena.