I have way more energy after finishing a shift from a white collar job vs. finishing a shift at a BS job. BS jobs are exhausing -- you are on your feet all day, carrying things, moving around all day, dealing with customer complaints, etc, etc.. and by the time i finished work i had no energy or motivation to do anything else besides rest at home for the remainder of the day.
of course everyone is different, but for me, even part time BS jobs were really tiring (physically & emotionally). with the job I have now, I think i work about 5 hours "real work" a day and spend the other 3 surfing the web, reading internet articles/forums, etc. Unlimited paid vacation is a nice perk also.. of course every white collar job is different, but if you talk to people there are definetly jobs you can find that are easier & require less effort than others.