I played in a simul this weekend... 10 normal guys aainst GM Ben Finegold. That was a cool experience. Naturally he anililated me. To tell the truth, I felt more intimidated my the time control than by the GM factor. (whether or not this a rational way to feel is up for debate.)
I also played a casual 5 minute blitz tournament, for lack of anything better to do. I did badly. Lesson: I don't think fast. Or maybe I don't decide fast. (But everyone who knows me already knows this.) Is there a remedy? For now, I'm good with it. Eh. It is what it is. Life is good.