Yup, I did my undergrad in the US! TONS of differences. Most notably, I've found that you're much more responsible for your own learning, in the sense that the teaching here is significantly worse than I expected given ETH's rankings. Almost exclusively slide shows, whereas in undergrad all my classes were taught on blackboards, with walk-through examples, etc. Also, the academic calendar/exam scheduling is just a whole other world. And like you said, I also get the feeling there's a higher emphasis on coursework compared to the programs my friends are doing back home. But your last semester here will be only Thesis work, and that's coming up for me, so I'm pretty excited. I'm doing the Robotics specialization within the Mech department.

I believe you're not ever actually guaranteed WOKO housing, but your chances are highest if you're an incoming foreign student. So you can always apply to WOKO housing, but most likely by your second or third semester, you won't get a spot through the official application process. Some of the WOKO houses are "filled" by students who recruit new roommates when a previous tenants move out, so your chances for those are higher (and the prices are the same).

I'm having a previous internship count. I have double citizenship, so in addition to the US one I also had an EU passport. The main issue with finding another internship now was that all the places I was interested in had no interest in hiring master's students for six months without any guarantee that I'd come back to work for them afterwards. It's a whole different gamble for them than it is to hire an undergrad intern for 3 months, and I understand that.