I never had Golytely, but they say if you drink it ice cold, then your taste buds will not be as sensitive to the flavor. Also, use hemorrhoid ointment-- Nupercainal or such to prevent anal irritatition from all the diarrhea.
Good luck. Besides that, the prep is the worst part... remember, if you're not drugged enough during the procedure, tell them! This should definitely Not be a horrible experience.