I refuse to drive a car in rush hour traffic and am lucky enough to have a job that lets me keep to that.
By car my commute is ~13 miles and takes me about 25 - 30 minutes as long as there's not an event in one of the stadiums I have to drive past. My bike route is ~19 miles and takes me about 80 minutes as long as I don't have to wait for one of the two draw-bridges to cycle.
A bus commute isn't a very good option for me as it takes a minimum of 90 minutes if I make the downtown connection. It can easily be 2 hours if a bus is late and the connection is missed. If I'm going to take that much time out of my day, I'm going to at least get some excercise and not be subject to strangers' body odors.
Bottom line is that it does take me quite a bit longer to ride to work but I will always get to work and get home in a much better mood than days that I drive. It's ALWAYS worth an hour out of my day to get home with a smile on my face.