I think the two biggest factors are day/time of departure and if you have to check luggage.

We left on a Thursday, our flight was at 4pm (boarding at 3:30). We arrived at 1:30PM which was WAY too early - no luggage to check so did the kiosk check-in (that took about 30 seconds), walked right though security in 5 minutes. Didn't use Club MoBay either. We sat around for more than an hour and a half.

I've had lines before though, usually on weekends. Always to check luggage (which is why I generally don't do it).