^Not that I've been (well, I have but it was years ago before they had ANY rides), but if I was in Florida I'd make the effort to go, if only for Manta, which looks amazing. Then you've got Kraken, Atlantis and the kiddy coaster.
Sea World isn't about the the rides though; they're more of a "bonus" that you get along with the animals and shows, which is what most people go there for. If you're going with the attitude to "get the credits" then I doubt you'll get much from the place.
Similarly, I'm having real problems in deciding whether I want to spend so much money to go to Sea World in San Diego. There's only one coaster there, I'm not really into the whale and dolphin thing, and I've been to enough aquaria to last a lifetime.