LiveinChicago83- I agree with you. Being a non-trad/post-baccer myself, I definitely feel that working full time and taking science courses on top of that is a tough road. I don't care if it's 1 class or 3. Leaving work early to go to class, studying around one's work and travel for work schedule, commuting, etc, is hard. By downplaying the difficulty of full time work and classes, if in fact the adcoms - not just the adcom posters here- do so, we are getting short-changed. Working part time and work study on top of a full time course load is considered challenging, so why not the reverse?
As an undergrad student or in a full time post-bac, school is your job. Of course it is, or should be, challenging to the individual but in my experience, working full time and taking classes is harder than being a full time student. 4-6 class hours a day (20-30 hours a week) is not the same as an 8 hour work day plus class (40 hours work/week + 4-6 class hours a week per 1 class = at least 44 hours/week).