So:

I used to work downtown as a messenger. So that was pretty much urban riding all day, every day. During that time I also tried to train and do rides and races on the weekends.

My current job has me commuting 11 miles each way to work. I typically stretch each ride to 20-30 miles for training purposes (I still race).

Basically, you adapt. Nowadays if I was to just ride to and from work it would feel like I was hardly doing anything at all.

Everyone has given you awesome suggestions. My one addition is that it is typically mentally harder then physically harder. Take that for what it is worth.