I started off as a roadie long before I ever had a fg bike, and I'm still pretty roadieish. But man do I love riding track bikes on the street.
Around Austin, there is a pretty big group of guys who are similar to me in that they are roadies but ride FG bikes a lot of the time. It's not uncommon to see one of us riding FG bikes dressed in a full kit w/ clipless pedals, etc. A lot of these guys race road bikes, too. It's pretty cool b/c it makes training a bit more fun.