I've only done this once: Broadway production of Doubt. The entire cast was so warm to the relatively small group of people waiting -- especially Cherry Jones, who probably spent about an hour total having individual conversations with each person waiting, asking their opinions about the play (did they think Father Flynn was guilty or not, etc.), etc. It was a wonderful experience, although I decided thereafter that the stage door scene really wasn't for me.
"You travel alone because other people are only there to remind you how much that hook hurts that we all bit down on. Wait for that one day we can bite free and get back out there in space where we belong, sail back over water, over skies, into space, the hook finally out of our mouths and we wander back out there in space spawning to other planets never to return hurrah to earth and we'll look back and can't even see these lives here anymore. Only the taste of blood to remind us we ever existed. The earth is small. We're gone. We're dead. We're safe."
-John Guare, Landscape of the Body