SROS208 - Its Easily Possible to Do all the Coasters in 1 Day, I even Done it when taking my First ever Trip to the park earlier this year and easily managed all Adult Coasters(excluding Jr Gemimi) in 1 Day, I even got Re-Rides on Most, Plus Rides on a few other things like the Pirate Ship,Power Tower and White Water Landing.
As for Lines, I didnt find then very long at all, Cedar Point had some of the fastest moving lines I had ever seen, and I have never seen a park to decided to capasity even the park isnt desperatly Busy(Magnum,Raptor,MF and Iron Dragon all ran superb 3 Train Operations, while all other coasters at least had 2 Trains Out) Power Tower was running all 4 Towers, The Log Ride has all Boats Out and So did the Rapids. The Longest Queue I experienced at the Point was of course MF at 50 mins, But I had many Walk On Rides on most rides including a few coasters.
So Dont be put off by reports of long lines at CP, They handle Crowds really Well, Of course Its always best to go on Weekdays though, Weekends can be Hell I have heard. If you do go to CP sometime, Enjoy It, Its a Great Park