I think I'm hitting true bike-commuter status after doing it regularly for the past 6 months.
I was riding home today, and after getting passed by yet another girl on a sketchy looking big-tired bike with baskets, I realized that I can't even remember the last time I passed someone on a bike on my bike commute (which is short - like 3.5 miles.) In fact, usually everyone passes me at nearly twice the speed I'm going. I probably go only 12mph max on the flats on my mtn bike commuter. I think I've reached "commuter zen" where I'm at peace with my fellow cyclists on the road!
(And yes, my "other" bikes is a pricey Cervelo TT bike. I can average nearly 24mph for a 1hr time trial on it!)