I visit four times a year but have never seen lines. They are opening a new coaster in May and the line for this new ride will likely be long. The description is below. I hope it opens a bit early so you can ride it. By the way, I loved the food at the old Smokehouse.
"Coming May 2005, SheiKra will dive into Busch Gardens Tampa Bay. North America's first dive coaster, SheiKra is 200 feet up, 90 degrees straight down, and like nothing else in the world.
The name SheiKra evokes the power and speed of an African hawk as it twists and plunges - giving riders a 70 mph, adrenaline-pumping experience like no other. At 200 feet, SheiKra now takes the crown as Florida's tallest roller coaster. This thrill machine is also the tallest dive coaster in the world and the first of its kind to incorporate an Immelmann loop (a rolling maneuver), a second, 138-foot dive into an underground tunnel and a water-feature finale. SheiKra offers three minutes of over-the-edge excitement on more than half a mile of steel track.
SheiKra will serve as the centerpiece of Busch Gardens' newly themed Stanleyville area, which also includes the new 500-seat, indoor/outdoor Zambia Smokehouse. The restaurant is situated on the coaster's perimeter, allowing guests to be a part of the action while dining."