In later years during weeks with a large portion of lab work it wasn't uncommon to have 40+ hour weeks.
While I was an undergrad I rented a flat with a good friend of mine who was doing a B.A. (majoring in creative writing). He would complian if he had more than 7 hours a week.
There was a certain element among engineering students who reveled in the percieved difficulty of the degree there was a lot of 'machoness' about how hard the course was etc and there was a tendency to disparage other faculties particularly the Arts faculty. Which of course is nonsense.
It's also true that the non-quantitatively inclined do find some of a good MBA core curriculum pretty hard. I did some tutoring and in economics, among other things, and I had students who couldn't a simple equation. One once asked me to "explain how graphs work," i.e. basic x-y axis price elasticity, etc. Every few years there seems to be a book written by someone who really struggled with basic math in business school.
As pre-med isn't an undergrad degree in the states, we'd probably find pre-meds with engineering undergrad degrees outscore other majors on the MCAT. The engineering grad is also a bonus for admission (given way too many chem/biology applicants). Not that this happens very often, however.
After I got my EE degree I took the GRE and GMAT and aced them, getting 95th+ percentile, without studying at all. I then enrolled in a MBA program and was shocked at how easy, and unrigorous, the courses were compared to EE classes.