Highly amusing. In my experience, even Mac users do not know what the green button does. I've heard people say, "Every time I click it, the size of the window changes somewhat, but I'm not sure in what way.".
Yes, that confuses a lot of people. 'Zoom' toggles between the 'standard state' and the 'user state'.
"Your app determines the initial size and position of a window, which is called the standard state. If the user changes a window’s size or location by at least 7 points, the new size and location is the called the user state. The user can toggle between the standard state and the user state by clicking the zoom button in the title bar. Follow the guidelines in this section so that users can have the zoom experience they expect."
"Your app determines the initial size and position of a window, which is called the standard state. If the user changes a window’s size or location by at least 7 points, the new size and location is the called the user state. The user can toggle between the standard state and the user state by clicking the zoom button in the title bar. Follow the guidelines in this section so that users can have the zoom experience they expect."
https://developer.apple.com/library/mac/#documentation/UserE...