^It shouldn't be too bad. If you really just want to get those credits hit up Medusa when you first get to the park(hopefully you will be getting there early) and it would pretty much be a walk on,but there could be a slight wait.
Boomerang is anyones guess. It could have the longest wait in the park or it could be a walk on. Avoid going on it in the afternoon though, it usually is long by then.
For me V2 never really had a long wait. There may be a chance you will be stuck waiting about 20 min but no more than that. Just get on it early.
--Chris