I experienced this as well about two years ago when i started using two 21" monitors. But not long after that I traded in my desktop and have been using a laptop with a 13.3" widescreen display almost exclusively (home and work). So now I’m back to the one maximized app at a time paradigm. And unless I’m mistaken, more and more people are buying laptops than desktops these days. And even further down the line, people will start using their TVs as primary displays, which obviously requires a completely difference kind of interface.