I've noticed one big difference in classrooms coming from junior high and high school and entering college. Teachers don't 'personalize' their rooms in college. Why? Because most often they are moved from semester to semester, and sometimes they teach in two or more classrooms. So any materials they need they have to bring each time. In the lower levels schools they get to stay and organize the room. So those teaching college have to made do with varying classrooms. Not to mention some teach multiple subjects.
So students are not the only ones running from class to class in college.