There is definitely some kind of sorting process when it comes to the kiosks... I think it might have someone to do with whether your flight is direct/nonstop.... I could be way off! I used the kiosk last year. With CMB I was put at the front of the line.

I like CMB for a variety of reasons, but mostly the service. The fast track is definitely bonus when it works in your favor! I enjoy the departure lounge, too.

I fly in and out on Saturdays in late April/early May. This year arrival will be early, around 10:30, so I don't think there will be much in the way of fast track, but I'll be ahead of most of the people on my flight at least.