I crashed on a fast downhill at 47 mph 2 Octobers ago. I was getting carried away on some really fun downhill sweepers. I was lucky that all I did was break some ribs, break my right pinky finger and wind up with bruises and strawberries on my chest and face. Both my wheels were taco'd and blown. My helmet interior cracked down the middle.
Strange thing is, I'm not skittish or traumatized mentally by the experience. I learned my lesson but I still am an aggressive descender. I got my wheels rebuilt. I pay better attention to my brake pads and their adjustment. I do descend on the drops and make sure to keep 2 fingers on each brake lever. I reduce my speed going into hairpin turns but if I can visualize the exit from the turn and plot my line (cutting the apexes) it is often possible to fly through the downhill with minimal braking.