My answer to the question in the headline of this Brad Plumer post, which you should go read.
Driving is expensive, time-consuming, boring*, makes you road rage-y, pollutes the air, and cooks the planet. What's not to like?
Taking the bus or train is no picnic, but at least you can let the driver stress out while you relax. Biking is also not a magic carpet ride, but at least you get some exercise and fresh air and it's extremely cheap.
I would also point out that advances in phone technology have made taking the bus or train significantly more fun. It used to be that you'd have to lug a book or a Walkman with you if you wanted to read or listen to music - and if you forgot one of those, welcome to Boringville. Now I can not only do either of those things on my lightweight, long-battery-life iPhone, I can also play games, read news or text my friends, and it's already in my pocket so there's no remembering involved.
* - I like long drives through scenic areas as much as anyone, but we all know this is 0.0001% of driving. The other 99.9999% involves wishing you were already there.