No, sadly, I don't get hurt on the job. I do that in my spare time. If I had done it on the job, I would have at least gotten some disability from the injury. As it is, it really doesn't bother me. I tell pretty much everyone that inquires that you really don't need that thumb as much as you think you do.
And yes, I do run the 200T (and other top-handles) with just one hand. Horizontal cuts to the right are pretty much out of the question, though. As you might expect, I use two hands about 3/4ths of the time. Simple trim cuts, I zip off with one hand. Occasionally, reaching out or around, I cut horizontally to the left, too. As you might expect, the right hand does not have as good control as a "fully handed" user might expect, so I compensate by being extra careful against kickback and slipping. Oddly, I can't run a 200t one-handed with my left hand. It's useless for that.
I got caught in a wood planer; careless, caught the tip of my thumb. It wanted more, and sucked in my hand until it plugged it up. I was making planks at the in-laws to build a really neat sandbox for my kids.
In fact, the sandbox turned out real well: an octagon around our pin oak, there were flip-out cover sections that made it look like an eight point star when it was opened up to play in. When opened up, the covers were a neat wood ramp into the play zone.