I posted a few years ago in this thread, but have had some lovely experiences since then, so I thought I'd share a few. Still all tours, still never actually been to Broadway

But wonderful people all the same!
- On the La Cage tour, there were only a few people at the door, and all for George Hamilton. But I talked with Chris Sieber instead, and he was so funny and nice! He was a guest villain on a TV show I used to love (Pushing Daisies, if anyone remembers that old thing!), and when I mentioned that, he lit up so fast and spent the next fifteen minutes telling my mom and me all about what it was like to work on that show.
- The entire Les Mis touring cast was delightful, but special notice had to go to Jason Forbach and Joe Spieldenner, who played Enjolras and Grantaire. I was working at the theater by that time, so by the time I saw the show as a patron and went to stage door, I'd probably sat through around 6 performances in one week. I told Jason that the staff fought the most over who got to sit in on his portions of the show, and he blushed and gave me a hug, and I had sat close enough that I could see those two were the dancing waiters at the wedding- I mentioned that and they got all giddy and started talking over each other about the funny things they did to amuse themselves during that- after all, they said, "we're already dead!"
- National tour of Cathy Rigby's Peter Pan. Heading past stage door at intermission to go to the restrooms no one knows about on the other side of the building. Outside the door is Captain Hook (can't remember the actor's name right now), in full costume, with his cell phone in one hand, a cigarette in the other, and his very friendly shih tzu at his feet. Illusion shattered :)
- Priscilla tour last year. I had seen Bryan West several years ago as an understudy Fiyero (the first time I ever saw the show), and, being a dorky teenager, had given him a little fan-note/card back then, which he had said was his first ever fanmail and had apparently been gleefully parading around backstage, according to other cast members. When I met him again at Priscilla, I mentioned that card, and he recognized me, even called me by name, and chatted for a while.
Those are the best I can think of right now but I've really never had a bad experience, to be honest. Most actors have been really sweet, even the ones in a hurry to leave, and a lot have said they enjoy hearing from the audience, especially when they've had a bad day or know their performance wasn't up to par, they like hearing that people enjoyed it anyways. Everyone's different, I know, but I've been very lucky indeed!