[JeffreyAK]

I've never taken any special care of my (mostly lacquered maple neck) electrics, and have never seen any problems with body, neck, frets or anything else that could be caused by humidity. As noted above, the neck would be the most probable part to have problems from high/low humidity. Other fretboard woods may be more susceptible. Personally I don't worry about it even with the ebony fretboard my Strat currently has, though fortunately I live in a region where the indoor humidity does not vary much from 40% - it's nearly always on a stand out of it's case.