In the opening week at Cedar Point (at least Mon-Tues-Wed) you are generally looking at, well, non-existant lines. I went last year on May 10 (the monday after the park opened, and never had to wait more than 5 minutes the whole day.
I've got my fingers crossed that i will be able to make the trip on the 15th (even though I am going on the 7th, too :))