The lines at Busch Gardens are never necessarily long, compared to queuing times at places like Universal Studios or Walt Disney World in Orlando.  
  
The average wait times on Busch Gardens Popular Attractions(For Me): 
Montu: Walk-On - 5 Minutes 
Cheetah Hunt - 10 Minutes - 35 Minutes 
SheiKra - Walk-On - 15 Minutes 
Kumba - Walk-On almost always 
Scorpion - 5 Minutes - 20 Minutes 
Gwazi - You might be waiting at the entrance of this one for a while, but don't worry! The ride is definitely not closed for good! 
Falcon's Fury - 15 Minutes - 45 Minutes 
  
In all of my visits to this park, I have never purchased a Quick Queue, because I don't need it. Hope this helped!