Look at Keith Carter's first 4 or 5 books: Hassy with an 80mm. Doesn't get any more classic than that. Keith doesn't lack for passion or imagination, either.

I saw a "photographer" in Piedmont Park once, and he had three bodies with different lenses hanging around his neck, plus a fanny pack and two shoulder bags. It was hysterical. I wish I had made a photograph of him because he kind of had to waddle with all that gear. You just can't work that way...

With one lens, you think about the subject, and where to place your feet and your body in relation to it. With more than one lens, you start thinking about lenses!