Hands down, my favorite part of bike commuting is how I zip past all the suckers waiting at the bus stop. They'll be there for another 15 minutes or so, only to have to pay to cram into a sardine-can-esque bus that usually smells of sweat and frustration....Well, I won't trash the bus, it's ambiance, or it's patrons. But I'll run with the central point -- getting to work on the bike is pretty satisfying, in part because I'm almost always moving, rarely waiting. Even though I respect the traffic signals. I may only be loping along at 15 MPH, but there's very little sitting, dawdling, or other wasteful activities. When you're as impatient as I am, avoiding those infuriating delays is priceless.
When I held my own Drive to Work Day, I noticed these two headed the other way, not moving terribly quickly, but they were moving. Unlike me, who was cruising about 24mph below the posted limit.