For MS Windows users, I think "Maximise Everything" is ingrained at this point, which gets increasingly ridiculous on high res screens since we don't have resolution independence.
However, the English language's z pattern is inherently vertical, meaning that a page should naturally have space on either side; forcing a window to fullscreen just to have a 33% column of text is asinine, and shows that the designer is a prick for thinking strictly for XP and Windows' maximize button.
You're right about Windows' "Maximize Everything" being weird, it seems more and more like it was a good stopgap for people switching over from DOS and needing all the pixels possible on a tiny screen. OS X's natural flow for page windows may get confused from time-to-time, but it's a much better solution for dealing with vertically-biased windows in a widescreen environment.
Weird, I had no problem reading your comment even though HN is formatting it for me at around 180 chars.
I use Multiple Monitors/UltraMon and the support for doing this with the mouse is lost (not sure if multiple monitors or b/c of Ultramon).
I guess I should have know there was a hot key.
(terminals and emacs through, more like 1/3)
There are dual problems here. Window Managers are designed to give a "comforting intuitive interface" rather than an interface which lets you do things quickly. But also, manufacturers pump out wide screens intended for video viewing rather than long screens which are suited for text viewing. This also means a good portion of web pages use fixed-width pages to keep from being stretched to unreadability. But these also keep the text from being read from a narrow screen (sure, they could set a max width with CSS but fixed-width also lets the designer guarantee their design looks exactly as they wish).
The vast majority of websites are no problem (text columns are usually no more than 700 pixels wide for readability reasons, I don’t care when I have to scroll horizontally to access other columns because my trackpad supports two-finger scrolling), some inherently need more pixels (The Big Picture wants to display big pictures and there is nothing wrong with that) and some just break (i.e. text becomes completely unreadable). I would be very happy if someone would fix those tiny minority of sometimes otherwise very fancy websites.
Yes, the idea that you would using multi, non-maximized windows at one time is behind the design of window managers.
Now, this model of interacting with a computer has been a success in the sense that it's how most computers are now organized today. However, this model has been a complete failure in the sense that few people ever use non-maximized windows because they coordinate so badly.
This is the reason browser tabs have replaced browser windows and indeed why the browser as an interface is easier to understand than the desktop interface ("just get me to a browser window and then I'll know where to go...").