You guys make good points about riding clipless. I hadn't considered running clipless on a fg or track bike, mostlly because I can't be bothered to change shoes for my 3-mile commute. But for longer rides, I can see how it'd make a substantial difference.
Also, on bibs, they're amazing. I wear bibs as opposed to shorts because when you're really leaned over, bibs distribute pressure all along the torso's front side, as opposed to how a waistband digs in on the waist.
The biggest comfort-related revelation for me has been a proper fitting. I paid $150 for a guy to put me on a medieval-torture-device-cycle-looking thing, take measurements, make me crank up to 120rpm in 5rpm increments, then hand me a printout of numbers in Dutch. He also fixed my bikes to make them fit better, and I can now ride with basically zero pain/pressure/numbness. 100% worth every penny.