I rode STP twice; first time was with my 2002 Davidson (with vintage Campy at that time) and the second was with my Cinelli Supercorsa (also vintage Campy). I, too, saw hardly any vintage stuff - but I was amazed at what some people were riding anyway (think Magnas and the like - wow!).
The plus side is that
everyone wanted to talk about "that old-school bike - and those
shoes!"
DD