It was useful of course.
The entire concept of communicating with other students with similar interests is really what University is all about.
Einstein should be the first to come to your mind as a Physics student: it is for me anyways. Einstein himself would agree that communication with other colleagues is very important, and most of his work wouldn't be possible without them. He frequently visited University cafe's. Andrew Miles, who is famous for proving Fermat's Last Theorem, started doing the proof in solitude, but later on realized that it just isn't possible alone.
Above, is pure proof of why you need people with similar interests, and goals. It's no theory.
That is one of the reasons you'll never hear about some guy discovering something amazing in his basement, without going university to learn all of this stuff. It's not merely self-discpline; it is the lack of COMPLETE understanding, and you can't accomplish this without discussion groups or debates.
I had to take a Business Law course in College, and that was my biggest draw back(no people interested). I did well on the first test, but not good enough to fully understand even though that wasn't my focus anyways. To me, it is a waste not to understand what is going on, and I had to do something. In the end, I signed up as a tutor(brainer I am

, and now I was getting paid to jitter about a subject I barely knew, and with a student who needed help.
The bottom line is... we all want to be that group of guys yelling in the library, cafe, restaurant, etc... about why xxxxxx is so messed up.