I was never much of a mountain biker and I never raced but I have flown down plenty of mountain roads and I was always able to leave my friends behind. Call it stupidity or lack of fear but I’m convinced it was that lack of fear that kept me safe. My slower friends would crash when they freaked out on a sharp bend or oncoming traffic. I’m not convinced there was much in the way of technique that translates over to motorcycling (at least on the road). One of the hardest things for me was to roll on the throttle mid-corner when you already think you are going too fast. There is nothing in cycling that compares to that.
briderdt is probably the most experienced cyclist on this board and he has mentioned in the past he felt it helped him a lot. Can’t say I understood his reasons but something about riding in a peloton helped him make the transition.