High School vs. University

Through my own personal experience I havn't really seen much a change between high school and university. Honestly, is there really a difference? You pick your courses, fill your requirements, read your text books, write tests, do assignments and finals. Last I checked that was the same schedule as high school students. Now eveyone always talks about the workload being so much more difficult, but I am yet to see anything that is expected of me that wasn't already expected in high school. Mind you I speak from my personal experience being in the Canadian educational system. Perhaps it is different for the american students but I feel I have been fully prepared for university and it was definitly an easy transition. Anyone care to differ?