I know of only one other "roadie" on our team that wears a camelbak while road riding (besides me)... *BUT* i was happy to see a TdF rider in the team TT with the tell-tale blue Camelbak tube draped over his shoulder (forgot what team... i think white jerseys?)
I've noticed that Camelbak makes some very aero models now... perhaps trying to attract more roadies?
personally, i can't live without mine! i'm actually headed out to buy one with a bigger bladder this afternoon (one liter just isn't enough for long rides )