Even on very crowded days I find that I still have time to hit up all the major rides. Don't forget to try and take in some shows and you have to try Skyline it is the best!'
As for Cedar Point I would hit up Maverick, Top Thrill Dragster, and MF first and Raptor towards the middle of day. Don't let the size of the Raptor line full you either. I have waited the entire queue full of people and was only about 90 minutes.