Just chiming in on the Chicago stage door as well as the Spamalot stage door.....
Spamalot is always a mob scene.... get there early, be upfront. For the most part, everyone signs. I have no idea about the new King Arthur and his signing practices, but he seemed very nice when I met him the other day at the theatre.
Chicago, a lot of the cast tends to bolt right away, so same thing. Get there quick and be up front (I dont even know if they put up barricades anymore or anything).
Also, visited a friend in the cast of Sweeney after a mantinee before Christmas and I think Patti is the only one who didnt come out. It was bitter cold and there was a small crowd, but everyone seemed to come away happy.
"You're every gay man's wet dream!" ~ MA
If in Heaven you don't excel, you can always party down in hell...