You're good at wiping out, it's a reflexive skill, like a trained boxer blocking or dodging a punch. There's maybe a split second between when you recognize a crash is inevitable, and when you actually hit something, and the decision you make in that moment is critical. Those who haven't cultivated the skills might panic, or freeze up, or just exercise poor body mechanics and then they have a story afterwards about how their helmet saved them from something worse. Or not.
I remember when I was younger doing an x-up (turning the handlebars backwards in the air so your arms make an x) over a pretty big jump. This was something I'd done many times before, but this time, while trying to straighten out before landing, my handlebars got tangled in my shirt and stuck at a 90 degree angle. Somehow, instead of landing in that very unfortunate position, I managed to stuff my bike down between my legs and behind me before, reasonably gracefully, sliding down the landing on my knees. I was completely unscathed, but a little baffled as to how.
I ride a lot more conservatively now and a lot less regularly so I don't fall very often, but it seems like when I do, that lack of practice shows. I don't seem to get as lucky any more.