If you're specifically going to be using After Effects, I'd suggest checking out AETuts: http://ae.tutsplus.com/ - they have some great tutorials covering animated "Logo Reveals" that you might find useful, that wouldn't require re-modelling it in 3D. There's a hell of a lot of stuff to plough through on there, so a few cool ones:
It depends on what context you're planning to use it in I guess. If it's just as a short intro to a video so you can have some company branding on there, I'd say it is.
If you've got more complex needs for it, then do whatever you think is necessary. It's really all down to context and the amount of effort you want to put in to it. I'd say if it's just a short logo reveal then you can produce something very professional looking without having to re-model it.