nope, I don't
and yes, I do
the reason I don't think its cheating is when you're using it for hip-hop (and mind you, "real" hip-hop, none of that new crap that they call hip-hop), or some other more electronic sound that gives it a cool sound. I'll even try and make it obvious by doing numerous things to it and editing it in a specific fashion so that it sounds like it's obviously being looped to add flavor.
drum loops are crap, though, when you're doing a more rock-type track or something that requires something more natural. drum looping is sorta cheating there and I like to either play or program them myself. finding loop libraries and throwing them in there is something I'm not really for.