I love to cycle and walk. Try to do a little of both every day, and I prefer working withing walking or cycling distance from my house. I like having good sidewalks and lighted crosswalks. I'm also a big fan of maintaining a good public bus system.
Still, I like having good roads and highways. I like it when they widen the street if a new subdivision crowds the original two-lane artery. I having a single-family dwelling and a little yard to play in, and a street on which we can rollerblade, having only local traffic, and not much at that.
Moderate hero. (voted new urbanist, given the false dichotomy)
The problem with widening roads is that more cars show up, wider roads are more dangerous and they destroy streetscapes.
Here's my basic philosophy. There's some balance to be had, there will always be a range from Battery Park city density to rural areas. But, America is waaaay out of whack in favor of cars and low density. We highly subsidize the automobiles to the tune of billions of dollars and we get cities that are great for cars and bad for people.