How difficult is being a good enchanter in groups?

[Hagglebaron]

I've never truly paid attention to what they were doing before. I know they mes etc for CC, buffs obviously need to stay up, debuffs like slow are important. How hard is managing all this in a fast moving exp group? If you are paying attention and have a modicum of skill is it not a problem to stay on top of everything, including managing a hasted monster of a charmed pet?