My commute is about 8 miles each way. Takes upwards of 40 minutes by car if traffic is bad (as it usually is) and 30 minutes on the nose by bicycle. Needless to say, I almost never drive. I always arrived at work completely aggravated at having been stuck in stop/go traffic for most of my commute (a real bitch when you drive a stick in a hilly city like Atlanta) so I just gave it up. I stuff my clothes for the day in my pack and grab a shower when I get to work (there are showers/lockers in several of the buildings here at the CDC). It kinda sucks when the weather's bad, but it's still not as annoying as driving.
This was definitely a factor in choosing where to buy a house, BTW. As pointed out by dmcowen above, the interstate traffic here is unbelievably bad so we bought a smaller house intown primarily to avoid being part of the daily suburban lemming/commuter crowd. I'd love to have a bigger house, but the extra 1-2 hours I don't spend in the car every day is worth the tradeoff.