I was at Disney World all last week, but took a day trip over to Islands of Adventure and The Hulk definitely wins as being at least the best coaster in Florida. Fire and Ice (Dueling Dragons) are also awesome. Rock'n'Rollercoaster at Disney MGM is good, the launch is fun, but too short, and Space Mountain and Thunder Mountain, both of which I have been on at least 80 times combined are those just for fun coasters. No real thrills involved.
I must also give an honorable mention to every coaster at Cedar Point, although Mantis, Millennium Force, and Raptor are my favorites there in that order. I haven't had the chance to ride their two newest ones yet. Maybe later this summer I'll make the journey there.
As for my favorite coaster I think that would be Superman: Ride Of Steel at Six Flags Darien Lake near Buffalo, NY. I have sat in the front of that ride so many times and it is simply amazing each and every time. I think what I like most about it that after dropping down that first 208ft hill you level out and then take a sharply banked left turn at a speed of 75mph only three feet off the ground. I love that feeling. Add the wind in your face and the shrieks of terror behind you and WOW. It is simply a great ride that maintains its speed and thrill throughout most of the adventure.
CVG777