I disagree. I have about an hour commute each way, and often times I can make it all the way to work without a single commercial. When they do finally run them, they are 5 min. blocks or so, and I agree that's aggravating.
But my radio has a pause function, much like TIVO. If I'm out of the car for a few minutes or get on the phone, I can pause it, then fast forward through commercials when the do come.
I have a 5 minute commute and get in the car pretty much as they start their ad rotation. As it is, I never listen to Stern on a normal work day. Not saying I never get to hear it, but it's generally not in the morning.