I live about 40 min. from Busch Gardens, and it is a great park. We go all the time and have passes. I say if you have the time, go visit! Great for all ages! I would get there right when the park opens to optimize your visit. Shiekra is the newest "Dive" coaster, however the lines get long fast. I think the open at 9am, so if you left I-drive around 6:30-7am you should be fine.
When are you going?
School down here in Fl. starts around the second week of August, so that will alliviate some crowd factor!
Have fun!