I've only met two Trek actors, Ethan Phillips and Brent Spiner. I met them a week ago. The Brent Spiner story Odo Ital tells happened to me as well. I asked how he felt about Data getting killed off, he very patronizingly said, "You do know this is a fictional character?" He'd already said that in response to a question someone else had asked in the same session.
Phillips was nice, a bit distracted but went out of his way to talk to my son during the signings which was really good of him considering we were just about the last ones to get the photo signed. I appreciated him making a point to talk to the kid.