I consider the descent to be the payoff for the suffering on the way up. The hill I did this on was included on the course for the 2003 World Road Race Championships, and I know every crack and every sewer on it. I take the whole lane while descending as I'm doing almost 30km/h faster than the posted speed limit for cars; my big concern is any cars ahead of me, not the ones behind.
New bike this year, maybe I'll crack the 80km/h barrier ... or my skull!