I'd venture the opposite - in that the more one flies, the less attentive (complacent) one becomes. I find that whenever I do lots of flights in a short time frame, I tend to 'forget' to board the aircraft in time while hanging at the lounge or in the bookstore or simply catching a few winks. I've never missed a flight, but have been startled to hear my name paged after time just got away from me.

It's also very easy to board the wrong regional flight if you're not paying attention. The regional Jazz C38 gates at YVR are well-marked, but many a person has lined up to board the Castlegar plane instead of Cranbrook; Kamloops instead of Kelowna. It's even worse in SEA at the Horizon C2 gates, as often the city is not labeled at the door in the 'tunnel' to the planes - generally, the baggage guys query you as you approach ("Kelowna?").

And perhaps that's all an FA needs to do in the doorway - simply ask "Winnipeg?" if there is any possibility of confusion. It may not solve a Rapidair scenario where flights leave every hour for the same destination, but it may minimize the disruptions real and perceived.