I should preface that I love to heal heroics and battlegrounds as a Paladin. I do a good job raid healing, but I just don't find it fun.
With heroics, there is usually time between heals to breath and with that time, I enjoy tossing in a little bit of dps. This is also the case with pvp. However with raiding, its straight up whack-a-mole.
I know that health pools are supposed to be quite large in Cataclysm and I know that there are some classes, particularly priests with their disc tree that has really buffed smite, it seems that Blizzard has recognized that its nice to be be able to toss in a little damage as a healer. But is this intent only with dungeons and pvp or will it also extend into the Cataclysm raid design?