"But doing CS, there were few opportunities to socialize with people in your degree - you see them in the lectures, then you go back to your college."

One thing I loved about my program (Baylor) is that they had a dedicated dorm building for engineering/CS students. I think it's because their program wasn't very prolific and they were trying to attract people (though I had no real complaints about it), but it created this awesome environment where the average person on your floor probably had a gaming desktop to show off, or would love to talk about a project idea you had, or might have an idea of how to recover the linux install you've just borked, or might be hosting a Minecraft LAN you could join. Not to mention the study-group opportunities, etc. It was a really great way to spend my first two years.