Ugh, this has never made sense to me. A “fit to content” button might make sense, but there should also be a maximize button (which is not the same as a full screen button). You might like having distractions everywhere on your screen, but I don’t.
If distractions are the problem, how does full screen mode not fit the bill? It's literally just the window content, nothing else. You can choose to show the menu bar and you can see the Dock by placing your mouse cursor at the edge of the screen.
If you really need Windows' behaviour, use something like Better Snap Tool to add maximise behaviour on right or middle click.
Or if you prefer Aero Snap-style resizing, Tiles can also do it, and it's free.
