My wife and I went to St. Martin for our honeymoon specifically to go to this beach. She's not a pilot or anything, but we both (literally) got a blast out of it. If you stand directly behind the fence you'll get punished with the sandblast, but that's why many folks wear sunglasses or goggles. We hung out in the water where it was still exciting but not as dangerous. Nothing is quite as cool as seeing that KLM 747 come in 50 feet above your head while you're floating on the warm Caribbean water.
For all the time I was there I did not see anyone get actually hurt by the wind, and I also didn't see anyone who looked surprised. It's pretty obvious what's about to happen, and people seemed to stay back and observe a few takeoffs and landings before approaching the fence.
Here's my favorite photo I took (attached):