i dont care what you find it. it is absolutely poor design to not have it as an option. how would it harm you if it was an option? exactly it wouldnt. it is not a difficult thing to acheive and many people find it useful. I know OS X isn't windows, but there is style, and then there is just plain bad design.
The zoom button (green button in OSX, was different in OS 9 etc) used to function in a similar fashion to maximise. At least, clicking zoom would resize the window to be large enough to display all content, click again to return to previous size; and if you held Option, it would zoom to fullscreen (bar the menubar).
Nowadays, the zoom button is so inconsistent between applications, I end up never using it.