The interstate is for people who just want to get to Point B and don't care about what's between there and Point A. There's a lot more of those people than there used to be, and gosh, do they drive fast!
I saw a documentary on the History Channel about what vehicle travel was like before the interstate system was proposed. That was back when major roads weren't always paved and changing a tire by the side of the road was something you had to do on a regular basis. I can understand why people of that era would look longingly toward the day when they could take a fast trip between cities on a smooth highway. But I'm also glad that there are still other options.