Thanks everyone for your responses, this is really useful stuff, keep em coming!

As a bike commuter, I guess I should include my own responses as well so here it goes.

1. Time to think and be alone/stress management (on the quieter sections of the commute anyway), I don't have to pay for parking and can ride right up to my building, burning calories instead of gas, general enjoyment of being on the bike.

2. I'd tell them it's a great stress reliever and it's not as scary as you might think. I second the idea of taking them for a ride along with me.

3. I tend to sweat a lot and that's an issue here in the Southeast, no shower or locker room at my destination so looking professional is tough. Securing my bike requires heavy and somewhat annoying to use locks. Transporting heavy or bulky items. There is no easy way to determine the best/safest commuting route other than trial and error. More variables that can lead to being late than traveling by car, requires more time and planning. Inconsiderate motorists.

4. 1 year continuously, I commuted and got around town by bike occasionally in years past including riding to class by bike in undergrad.

5. Singletrack. Around town I like to ride to the gym, built in warm up! I also like to go to breweries, parks, restaurants and the grocery store.

6. I like using a bike computer or strava because it's fun to see the miles add up. I like my serfas thunderbolt lights because of the form factor even though the battery life isn't too great. My new Roubaix Pro 2br tires, great ride, hold air well, and seem to be very flat resistant plus they aren't too pricey.