Photo by alancleaver 2000, Creative Commons
Although I truly enjoy riding to work every day, I basically have no choice except for cycling anyway since walking takes about 50 mintues each way and the bus requires a transfer and is otherwise quite inconvenient. No parking is available at my workplace either, but there is lots of bike parking and a locker room.
However, if I did have a choice, I would probably ride anyway. And, even better, according to a calculator at Kiplinger.com, a finance website, compared to driving I save enough money to buy a rather modest lunch each day. Modest enough to ensure that I will not gain any weight. You can figure out your own savings here here.