I'm a Software Engineer, I sit all day behind a desk.
I live in Lebanon and work in Liberty Corner. My commute is between 18 to 30 miles one way (as far as the hills around High Bridge on the way back). No showers, baby wipes are nice. In the winter I hardly break a sweat, but in the summer I'm dripping just looking at the bike. For that my coworkers are all buying shares of Tide Industries for "Tide with Febreze": sweaty clothes hold up well.
When I leave home at 7 AM I'm usually at work at 8 AM, that allows me to leave at around 4PM, which means these days I have to use lights. I'll commute up to three times a week when the weather/training regimen allows.
I love to commute by bike, I feel energized all day and sleep well at night. There are days without (obnoxious drivers, no energy, so cold my beard is all frozen, multiple flats and running out of patches, etc.) but even then it beats sitting in a car.
Usually car drivers pay attention unless they deliberately drive close (meaning they see you...). The scariest I've seen is cars passing me where there is no visibility and there is an oncoming car or truck... It really comes close some times.
Maurice