Its not about looking at 8 screens at once, its about not having to rearrange workspace to see everything, when doing web design a typical usage might be;
Chrome - google for problem solving,
A pdf explaining whatever,
test server settings,
testing web browser,
html code,
file directory,
php code,
more php code,
There we go, eight screens and eight things that might fill them at any one time, seamless switching from one to the other. And more still that could be added to the list.