Unless you've got a disability that prevents you from driving, I would go ahead and get a driver's license. (A quick glance at the driving skills of some of the other people on the road is enough to prove they're not difficult to qualify for!) Even if you then go ahead and use trains, buses, bikes and cabs for all your business travel, it's always good to have a backup option in case you ever encounter a good reason to drive a car instead.
If you manage to go your whole life without encountering such a reason, then you're out $20 or so for the license. Not bad compared to what your colleagues spent on cars in their lifetimes!