Actually lately, at least the time I went and from what I've been hearing from people, he doesn't come out of the stage door after night shows.
I've heard that the first couple of months he always came out and was gracious, but I don't know how often he does it anymore. This is just based on when I went, and a couple of other people, so I'm not saying he never does, it's starting to seem rare however.
"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