The only real classes on WoW that heal/DPS are really a spec of Priest and some totems with Shaman. I was a Druid for 10 years which is a heal over time healer so my time was spent constantly refreshing heals on the raid and the tank, there wasn't really time to DPS because you were constantly working your HoT rotation.

If FFXIV had a class like that, I'd be in heaven. As it stands however, I'm just not comfortable DPSing at this point (At least with my WHM which I'm leveling to 34 for Stone Skin).