I went to one of the universities mentioned on this thread. It wasn't completely free choice, in the sense that we had breadth requirements that we had to fulfil over the 4 years (so people who ended up majoring in eg. english literature would still have to take a couple of courses in science, maths, philosophy etc.).
And then some of the majors had a lot of requirements that were too much for just two years, so you would have to have a pretty clear idea from the start to have enough time to complete all the requirements in 4 years (because as a general rule, you have 4 years x 2 semesters x 4 courses per semester = 32 courses). The major I chose had one of the fewest requirements, but it was still 12 classes to graduate (not all of which are offered every semester), plus there were 12 breadth requirements, plus my first year I took some random classes which used up another 4 or 5 courses... so it's not a total free-for-all. Most semesters, I took one breadth requirement, one or two courses for my major, and one totally fun course if I could. A lot of people mucked it up, or changed majors later on, and then had to just take courses in their major and crowd in a 5th class to graduate on time. My brother got to the very end of 4 years, including taking a year off, and realised he'd left out ONE of the breadth requirement classes and had to come back for one more semester to do some kind of literature class - when he was a physics major and had spent the last two years doing physics. My parents were furious 
My first year I had to share with 4 randomly assigned girls in a suite with one bathroom, three bedrooms and a sitting room. It wasn't great! My second year I shared a bedroom and bathroom with another girl (that I chose), it was ok except when we fought and I ended up living with my boyfriend at the time which wasn't massively healthy. My third and fourth year I had my own bedroom, but shared the sitting room and bathroom with one other girl (again that I chose) - that was much better!
No sororities or fraternities at my university so I didn't experience any of that but there was one down the road where it was absolutely insane, they didn't have enough accommodation for freshmen so they all needed to rush a fraternity just to find somewhere to live - we used to watch from afar, agog, as some of the cleverest kids in the world did some very, very stupid things just to get into a frat. I think that's all changed now and all the freshmen at least live in an assigned dorm.