I really want to go to Cedar Point, it's an 8 hour drive for me so I haven't gotten there yet but I will get there one day.
My 2 favorite parks are Hersheypark and Six Flags Great Adventure. I have season passes to Great Adventure and Dorney Park (Dorney is nice but not as big of a park as the other 2) and usually go to a park once a week when they are open.
I like Hersheypark since it has my #1 wooden and #1 steel coasters and as someone else mentioned a great variety of coasters and other ride types.
Great Adventure basically is all coasters and kiddie rides with very few other ride types but the coasters are amazing. B&M is my favorite coaster manufacturer and they have 5 B&M coasters (for those familiar with the park they are Nitro, Batman The Ride, Superman Ultimate Flight, Bizarro and Green Lantern) so I am very happy with the park. It also doesn't hurt that the park has the world's tallest and North America's fastest coaster, Kingda Ka. Going 0 - 128 mph in 3.5 seconds is amazing, especially when you are in the front row and you feel like your face is being pulled.
I also like Knoebel's, that is a very traditional park with older rides including 2 wooden coasters but it is unlike most of the larger parks, especially corporate parks. Free admission and you pay per ride or buy a wristband and the prices are very cheap for both rides and food plus free parking.
It's times like this during the winter when opening day for Great Adventure isn't for a little over 3 months that I wish I lived in California or Florida so I could ride coasters all year, I hate the offseason when all the parks are closed. If parks were open all year, I'd go even if it was freezing out. Closing day at Great Adventure the temperature was in the mid 30's and it wasn't too uncomfortable.