Yeah, this is a great tip. I use Word, and you can do the same thing, i.e. see all your chapter headings in the clickable Document Map, by giving them the Heading style. If you want to format it to how you want it, give the first one the Heading style, then format the font, size, etc., right-click and tell it to update current style. Then when you make your next chapter heaing into the Heading style, it'll automatically format it for how you want it, and you'll have the TOC in the Document Map really easily.
Another thing I do, is to give brief descriptions after my chapter headings so I can see what happens in each chapter in the Document Map if I need to go back. Before I send the doc out to beta readers, I do a save as and delete the descriptions to create a clean copy for them.
Thanks for starting this thread.