I'm not a good climber since I am a lardass now, but on the flats, I'm always itching to go. Usually I'm the one who attacks at 30 mph. Over in Davis, the only elevation we had is the overpasses, but those are not very steep so it's still very easy to ride wheels and attack at 20+ mph.
I used to ride in the slow ride with my hybrid commuter bike. In the medium to fast ride, I love it when others try to attack. I always am able to latch on. It's more about keeping your senses aware. There's always a slight body movement and a change in sound when the guy goes. Immediately I go out of the saddle.
I used to do heads up sprints with the sprinter on the Davis collegiate team although he'd be on his fixed gear. Always a fun and close match