Things I like about commuting by bicycle...

Daily cardio to keep the lungs and the ticker healthy;
In the summer it is easy, in the winter/rainy season it is difficult for the fair weather cyclists, all the more for me to keep going year round;
Justification for expensive purchases, like merino wool for warmth, and other fun accessories like high lumen lights and gadgets;
To enjoy the urban/natural surroundings, the air, the trees, to hear birds and other wildlife;
I get to work faster than if I took Trimet (the public transportation here in Portland);
Save $$$$ and reduce my carbon footprint by not owning a car;
To smile and greet the other cyclists on any road I pass;
Meditation while on my bicycle.