You can organize your site, see it all in one view, jump around to edit and more - all from an interface that sits in the admin page. Convenience on so many levels. Nothing complex or superfluous to deal with.
I do not have a large site, yet. I have MU, so I will have more than one site to deal with. I am extremely pleased to have found this plugin at my start-building phases. I am not an organized thinker nor planner so this is life saving for me. No matter what the site size.