Well, couple things. Horton, I see your point I'm sure you're right about a lot of actors still putting on a show for you, but I don't think that's the case with all of them. There have been quite a few actors I've chatted with at stage doors, and I have gotten to know them a little bit, not to say I'm friends w/ them or anything, but...you know w/ them you're having a real experience, and you can tell they enjoy chatting with you. Maybe these actors are the exception but still, it is true for some.
Also, Jason about the photographs...again, I think it depends. I'm sure this isn't even your point but for the record, also possibly because I'm very short, I'm never the one to put my arm around, I let them dictate that. Some will take a face-to-face picture, some just stop at the stage door next to you, I certainly don't reach my arm out if they don't first, though quite often they do put their arm around me. I don't think many people would show these pictures to people and actually say they're best friends, sometimes it's just special to have. I think it's known just b/c you take a picture w/ someone, it doesn't mean you're best friends, but it at least can show people, look I saw this person close-up and if nothing else asked for a picture, and they were kind enough to take one with me, yay. Again, this may be more in the minority, but there are actors that always encourage pictures, and sometimes specifically ask to be sent them for a website or just to be sent it. I've had friends show me some actors who actually put some of their pictures w/ them in their dressing rooms, it's really cute actually. I totally agree you shouldn't impose and should always treat them as normal people, but just saying everyone is different, to completely generalize doesn't hold. Hopefully, one can have good sense to see who does enjoy chatting w/ you and who's in a rush to get home and can act appropriately, but you certainly can have an enjoyable experience asking for a photograph, etc.
"If there was a Mount Rushmore for Broadway scores, "West Side Story" would be front and center. It snaps, it crackles it pops! It surges with a roar, its energy and sheer life undiminished by the years" - NYPost reviewer Elisabeth Vincentelli