Before I bought a car again my other option was taking the bus for which I absolutely despised having to take. I don't make a lot and have a lot of bills to pay so saving a few dollars a day by not taking the bus would help me out a great deal. Plus I would arrive to work 5 minutes faster than if I had taken the bus.
I like riding my bike, but I also like driving my car. If I am not running late and it is fairly decent outside I will usually take the bike.