As a WHM you have the usual one dot, one nuke plus Presence of Mind, Assize and Afflatus Misery in order of acquisition.
Since you're pretty much immortal as a healer I just pulled as many mobs as I could reach without them resetting with my dot and then Holy spammed them to death at 45+. Faster and at least slightly more fun. But you're not going to get some exciting gameplay changes in regards to dps down the raid. At level 4 you have both skills and from then on, nothing really changes.
At really low levels, CNJ/ WHM hits harder than most dps but you fall behind the closer you get to HW when dps get higher potencies and more skils.