You're right- it was a generalization. I think the amount of actual dashboard-button-pressing without looking away is extremely low, probably 1 button. The rest might be usable a quick glance, but so is a touchscreen.
I suppose that's true. I was thinking of my car, which has a lot of buttons on the steering wheel itself. They're easy to use without looking, since you don't have to change your hand position, and I control music entirely with those.