Some countries do indeed have cities where things are in walking distance, or a working public transport network. In those cases you can get by without a driver's license just fine. (In the city where I studied getting anywhere with bike and/or public transport was often faster than by car.)
This is me. I live near the centre of an English town that, due to local geography, isn't far from some quite rural areas and is well-connected via rail links to two decent cities (20-30 mins). I can drive, but I've simply not needed a car. Other than the odd inconvenience (trips to IKEA or day trips off the rail network) I love it.
EDIT: Google's recent inclusion of bus services in the public transport routing information for Maps has made it even better. Cheers for that, Google!
