Leaving aside the issue of cost for cars and parking (which is a big issue) i'd say that biking is more convenient in a pretty limited set of circumstances. I live in a big city, close to a lot of the places I go, and that means biking is actually quite convenient, and driving not so much.
In other places, driving is pretty convenient.
If you take into account the hours you spend getting together the money to pay for your car though (and the inconveniences you live with while working) ditching your car might sound pretty good!