I biked to work couple times, but then decided not to.
The problem is - you share the road with *cars*. So, unless there is a dedicated bike trail or a separate bike lane, it is simply too dangerous. First: the drivers do not want to share the road with a slow moving object - not only bikes, but even seniors for example. Fortunately for seniors, they are usually inside very big and somewhat safe cars. Bicyclists are not. Second: chances of staying intact in an accident for a bicyclist are much lower compared to those of a car driver/passenger. Now, let's combine the first and the second... And I haven't even started with bad weather, visibility issues or intentional desire to hurt a bicyclist (ugly, but possible).