Major overhaul? I've never heard of that- If you deal with basic maintenance as you need to and fix little things as they crop up, you shouldn't need a "major overhaul" unless you got an old beater bike that's suspect. I don't even know what that's supposed to be- with cartridge BBs and sealed headsets there's not really anything to overhaul. If it ain't broke don't fix it.
You didn't get this idea from a bike shop, did you? $$ People in the North do this themselves as an amusement in the winter, but after years of cycling I've never had a major overhaul past bringing a mt bike home in peices in baggies to dig dirt out of the components.
When you had this last major overhaul what did they do exactly?
Curious

Lizzy

Letting some squirrel screw with your bike is a good way to kill it young. Be very picky about who touches your bike! Just any twit in an LBS is NOT priveleged to lay a finger on your ride.