Although I find the 'us' versus 'them' a little bit silly I would like to add one aspect most people here did NOT notice.
Even if most 9-5ers might over all get a slightly longer duty time than the ones up in the tincan (I have never worked 9-5, it looked more like 7-7 or so), on the ground you very seldom have to work at times that go against your body clock.
I guess any long distance pilot (as cargo boy already mentioned) will be able to confirm the jet-lag does create some fatigue. Personally I am always amazed how crews can professionally fly an aircraft again after the rest time while I hesitate if I really should take that rental car to the office or have someone pick me up or actually try to sleep a bit more...
And now back to topic...