Seems that everybody is telling something else regarding the fast-track use for Elite Members. Some weeks ago when they just opened the fast track I haven't recognized even that it exists (it was early in the morning). I was waiting in the cue just next to the fast track and the police guy at the fast track was even askin my why I'm in that cue because status members can use the fast track. So I changed over and since then I always used it.
BTW: I never saw somebody controlling boarding cards or status on the fast track and everytime there are several people using the fast track even with normal Y-Tickets. Brassiness wins!