I was riding up into the hills (~800 foot elevation climb) daily, and the descent was pretty quick. I saw cyclists speeding down that hill probably doing 25-30 mph, maybe more. I think I held it to 20 max, probably less usually (I had a bike computer displayed). The thought of what would happen to me if I skidded on a bad patch, hit a pothole, or had a flat, was plenty enough for me to keep pressure on my brakes.
I stopped riding into the hills when I developed tingling in my left hand. I thought it was a pinched nerve in my neck. However, I just had EMG testing a couple weeks ago and it was determined that I don't have any, which would be cervical radiculopathy. What I do have is severe carpal tunnel syndrome in both hands. I had an EMG 20 years ago for my left arm and the guy told me he saw signed of some carpal tunnel at that time, just an FYI.
I figure I'm going to have surgery for the CTS. Who knows, maybe I can get back riding the hills or other general recreational bike riding after that. Right now, I just bike to get around town.