This is great feedback, thanks to everyone for sharing.
I guess what I'm getting at is that there was a significant advantage to W! contestants being able to watch from a green room, because so much of the format was about strategy. Even one extra block gained from knowledge about a contestant's charging pattern could swing the game.
To an extent, this would also be an advantage on J!, but only to the extent of plotting strategy against a champion with odd habits, like category jumping and the like.
For shows like Password and others, I don't see as much of an advantage.
If you had Whew! as #1 on the list of Shows Where Green Room Contestants Got A Notable Advantage, I am not sure what would unseat it.