I am running all my fav operating systems I need and use in my studio on several computers for different reasons each one. running ubuntu, osx, windows-xp at the moment, my computers are triple-boot, so it is a paradise of OSs here. I am 35 and I got my first computer when I was like 8 or something. To my view, maximizing a window to full screen size is a MUST for an operating system. mac is missing something, it could have a 4th button instead of completely not being able to maximize a window, and I really don't care about the high fidelity when it comes to simple little things, that to some of you make it JUST different, JUST to be different, or easy, and to some others a pain.
In between many kinds of reasons I use a computer for, professionally, like audio production, I am also into web design. I have to say that previewing a website while creating it etc, needs full window size too.
Some apps also have FULL-SCREEN (not full window only). It is nice to support and love what you have I cannot go against this because I love them all. But in my case, I'm getting the best from each world.
In windows-xp tiling windows on the screen is a right click on the taskbar. It will stick them together ? yes. you will need to sort them better ? not always but lets say, yes. In mac, you will still need to sort them on the screen same way. no ?
Full window size is not that great for all apps in high resolution screens. it is 500% a MUST for screens around 1280x1024.
Alt tab switches greatly and very fast through maximized windows in windows-xp (example, dreamweaver/firefox).
Question. would you watch a movie in a window on your brand new huge tv-set ? I think you would set it to full screen to get the most of it. That's why Full window size or full-screen or window maximize is there, it's there for the user. for us.
And something last. When I do music production, I don't need any other apps running than the sequencer software. So I don't need the "lets work with all those windows together" thing, or something like that, that someone said. I don't even want to know there is an operating system at that time. All I want is 1 (ONE) and only thing (WINDOW) at that time (FULL).
anyway, mac osx is wonderful, none can say anything against this. but lets face the facts before we say that the + button is one of the reasons that makes mac's os better..
cheers