A brooks on my tarmac would look silly. I wouldn't even put one on my fixie.
Plus, my bottom hates them. Specialized toupe FTW!

I will second SSP that chamois are generally thin nowadays. The exception would be some of the cheap shorts seem to have a thick chamois.
Heck, look at long distance shorts with a small increase in padding. You will hardly see a difference between those and regular shorts.