To me its just a tool like many other things and as such, it being a very nice tool. It can be a big help or a big hindrance. Using it to help something look good when you can find other ways to improve it is distracting you from the goal of getting better. But when used as a tool to spot farther problems with the model like Caligraphic's mentioned its a benefit.
Its all about why your using it.

and yeah fun isn't it ???