I have been hurt a few times but never totally incapacitated so was able to get down with no assistance. The two times I had to perform aerial rescues had more humor than stress. The first was pre-lowering device and, in fact, was one of the instances that spurred its development.
We were removing large blue gums on a steep hillside with a roadway and primary power lines below. Trunk wraps were being used for friction control for lowering. Eucs have pretty good grip up until the time the bark starts shearing off. This was the situation when the wraps the groundman was using pealed off the rough bark and the wraps started sliding up the tree. As they slid up, they lost friction. But instead of letting go like most sane people would, he held on. Three times around the tree he went, then took off at a considerable rate of speed towards the canopy. His ascending arc took him out over the wires and the street below, he was hanging on for dear life, and his shoulder length hair was streaking out behind him doing a pretty good imitation of Superman. In no time at all, he was 80 feet off the ground, suspended in midair by just the grip of his hands on the rope. During his arcing ascent, his pathway took him out over the street and wires and at a good 200 ft altitude. Everyone was initially yelling at him to let go of the rope up until the point he became airborne. Then the tune changed to "Don't let GO!!!" I was already in the tree so it took no time at all to reach him.
We performed the Koala Bear rescue, where I positioned myself slightly below him and facing me he wrapped his legs and arms around me...TIGHTLY. We were able to descend in this manner safely.
The second was a young, wannabe climber, once again in eucalyptus trees. For those of you who have not climbed eucs, they can be a real test for beginners. They have very little taper, large trees often have the first limbs 60 oto 80 feet up. The young bark has a powdery feel with zero grip. In those days, removals were done with spurs and no top rope. So if you slipped, there was a good chance it was going to be a long slide. This young guy made it almost to the first branch before the adrenaline wore off to be replaced by abject terror. He slipped, grabbed onto the tree with a bear hug and wouldn't let go and couldn't move. I was a bit ticked. All the talking in the world wasn't going to get him unstuck. So I went up and got him. Tied him in to the limb above him and spent some time prying his fingernails out of the bark to where he could be lowered down.
He decided after that climbing was not for him.
Dave