Terrific summary by Branson. But since the picture he paints is a bit bleak, I'll try to brighten it with a few upsides:
1 - You'll be spending A LOT less time in class, as much as 50% less. (If you're STEM it will ramp up later)
2 - Many kids who took AP or IB classes in HS report that college is actually easier.
3 - You'll be busy, but when you do have free time you'll be surrounded by great friends.
4 - College girls!
5 - No parents!