Well the difference there is that a trip to Orlando usually lasts a week or two (even three or four weeks for us Europeans) of doing either just Disney or going all out and throwing Universal, SeaWorld, Busch Gardens, Legoland, Kennedy Space Centre, a day at the beach, the malls, water parks etc in to the mix and that takes planning and coordination to make the most out of this super $$$$ vacation.
A trip to Cedar Point, Six Flags etc is a mindless cheap day trip that yes, does not require planning. You drive up in the morning and drive home at the end of the day. So cheap of a day trip that if you don't get much done it doesn't really matter. You'll probably get the chance to go again whereas for a lot of people, Disney World/Orlando is a once in lifetime trip. There's the difference here.