Why does no one mention the mechanics of fixed, which, for me, is the real pleasure. Maybe it's because it is difficult to describe. The first time I realized that I could change my speed/bearing with a very slight turn combined with a half-rotation partial shift of my weight onto the rising pedal, I was hooked. The same move with a freewheel and brakes is far less immediate, and not especially fun.
I know that all bikes can bring out a rider's "style" but fixed seems to give a few more vectors of expression that make riding a little deeper.
I look forward to buying a road bike and learning of all the aspects which I am missing, but I know for a fact that the first time I don't feel the unrelenting forward pressure of the drive train, I'm going to be bummed.