And Canadian ones. Where I went to college, a 3.5 GPA for the average person was easily 80h a week of solid work, if not more.

Methinks your experience may be unique to your school.

I go to Carnegie Mellon. Its difficulty is comparable to MIT and Caltech, which I hear isn't a joke...

Although there most definitely exists those that would say all three are quite easy.

I go to Northwestern. We share a number of courses (some of the OS projects, Computer Systems, etc.). Definitely not easy.