I'm not talking about group rides, criterium, road race, or winding mountain decents.
Lately, I have found myself selecting my dedicated triathlon bike for my road workouts. Since I have tweaked and adjusted my tri bike, I find the aero position to be very comfortable and can lock into it for many miles. As long as I have open road or a good bike lane, I gravitate to the aero position as soon as I can.
Uh.... I ride my road bike during triathlons. Just don't think those "aero" bars are safe :-)