It really depenRAB on what your fears are. For me, the fact we don't see much is more scary then having a witch in a pointy hat running about.
By the time the film arrived over here, we'd already seen and heard too much about it. We were also, unlike most Americans, aware that the film was fiction and not a documentary! I imagine that had the film arrived here at the same time, and people went to see it with no prior knowledge then we may have ended up with a similar situation that BBC's 'Ghostwatch' created.