Many, many times over the years, including recently. Some will take off and fly with coaxing. I've found others that won't. I've found frazzled oldsters, younger bees, and drones. I haven't seen any DWV, but I haven't looked that hard, either. Most days, I can spot 1-5 bees crawling around on the ground between the two hives closest to the fence.
My beeyard is carpeted 4 inches thick with wood chips. I wonder if some of the "crawlers" are bees that are harvesting something from the chips. I've seen a cluster of 5+ bees in one spot a few yards away from the beeyard scrutinizing something amongst the chips. Water or sap, perhaps? I'll have to pay closer attention, and get some pictures. If I can catch them in the act, I'll post on my own thread.