well, there's plenty of things an internet connection is useful for when driving. Streaming music via internet radio/cloud music players/such things, getting alerts of speed traps via an app like trapster, live traffic updates, navigation/directions (with a GPS, of course), and probably other things i cant think of off hand
Granted, if the majority of your driving is basically "5-10 minutes in the car" type of driving, these things may not seem important, but back when i was driving an hour to and from work every day, the above things helped me out quite often.