I've never heard a generator 'run' at disney. Like others said they have power.
In general most campers keep it down noise wise. In all honesty there are certain loops that tend to be noiser and those loops usually are the lower priced ones. Seems like with alot of these loops, the entire clan comes and its over crowed on the site and of course crowds many times equals noise.
Most of us don't mind people having a good time as long as its not 'rude'. FT W does have quiet hours. Last year in the 300 loop which is a pricer loop, lets just say there were 2 sites that were over occupied. One was had tentS and the other was a 5th wheel. They were one rowdy group, totally getting drunk ALL night. I know many other guests complained and disney did evict them from the campgrounds the next morning. They had totally trashed the campsites.
Anyway, IF you ever feel a fellow guest is out of 'control' noise wise do call the front desk/manager.