I'm a former mechanical engineer that worked in aerospace, cubicle and all. Your post is 100% spot on.
I remember getting emails from my managers that had timestamps indicating 11:30 pm, 5:30 am, Saturdays, Sundays, etc. I received emails from these guys when they were on their two weeks of "vacation", tied to their blackberry. The project managers (engineers who moved up) were frequently out of town on business, sometimes for weeks at a time. Several of the projects required staying on site for months, with paid visits home about once/month and 60+ hr work weeks.
Two years ago this month I quit engineering and started flying for a living. I still haven't matched my old salary, but I'm much happier at work and as a person in general. I have full benefits, salary, and I work about 1 week with 2 weeks off on average. So I may not get paid as much, but I have WAY more time off.
Regarding the original email - Service advisor for Sears? YGTBSM... I worked at Grease Monkey for 4 years during high school and the first 2 yrs of college. It was by far the best motivator for doing well in school that I ever had. That line of work just flat out sucks. It's hard work, doesn't pay well, you deal with idiot co-workers and customers all day, and you have to take all kinds of stupid s### from customers while holding a smile. No thanks!