I like the portability of a folder, how one can bring it inside and store it, rather than parking it locked outside, where it can fall prey to thieves (or people who don't like you). I was also thinking about bringing one with me traveling, but from some research I find that this is very difficult with 26" folders.
In addition to the portability, I just like the look of a bike with regular wheels, and the ability to at least stay in the same ball park with the non folders.
Dean.