I love to see HowlOScream at Busch Gardens Tampa by doing the Ultimate Tour. I'm a big fan of doing Fright Feast and seeing things on my own, but I pamper myself at least once a year for signing up for the tour. This experience sells out very quickly, despite starting at $159 per person (not including admission).
Why are people willing to shell out that much money? Check out the list accompanying this article to learn more about what the Ultimate Tour entails. To sum it up, you pretty much get to do what you want, when you want, including both the haunted houses and the major rides, with little to no wait. Granted, you'll probably wait in line to check in, but that's the only significant wait you'll have all night. You link up with your guide, who takes you through the event doing whatever you choose until park closing time.
The haunted houses are the main draw, but you'll read about all the other benefits in the list. It's a sure way to spoil yourself once a year (or more). Don't forget, there are also group tours you can book. They're less expensive, and they still include front of the line access and beverage stops.