Course: More intense, but better equipped to deal with it as you're familiar with lecturers, the buildings, the school policy, how exams work, etc.
Friends: Tons more, made friends with everyone in second year, loved it. Joined societies that I was too scared to in first year as well.
Time management: I found I had probably about the same amount of time on my hands, maybe slightly more.
With my course we had 6 simultaneous modules, so it was a step up from college where I only had 4 subjects. It felt like I had to learn how to have a full timetable again. By second year I was used to everything and comfortable and not ******** bricks every time we had a lecture in a new building or had a new lab session or something.