Maybe it's the enthusiast in me speaking, but is it possible to be scared of Nessie, but not of multiple launches?
Anyways, I see what you mean by the "mild thrillseekers" but BGW has traditionally had its coasters geared towards bigger thrillseekers, so when you had BBW there, it served as somewhat of a buffer coaster.
In retrospect, that could be a wise marketing move for BGW, if it does turn out to be family oriented. Looking at the park right now you have Sesame Street for the younger thrill seekers, and three coasters for the older thrill seekers. Nessie stands out because 48" doesn't classify a coaster as family friendly, but yet, I would not call it an "extremely thrilling coaster".
So, yeah, right now you have a few flats, and a few 3-D movies for the moderate thrillseekers, but no coaster. Especially with Mach Tower next year, Busch Gardens is going to need another "buffer coaster" for those who have outgrown Sesame Street, but haven't quite reached the point of the other coasters.
Parks Visited in 2012: Busch Gardens x8, Six Flags New England, Knoebels, Carowinds, Kings Dominion x2, Six Flags America