"Quick Navigation" I missed the class on that ;-)) Am curious too! Plus the map to treasure chest and I am all set!
Quick Navigation has been around since previous versions. Whenever you navigate through your code - by selecting a Sub/Function in the F2 dialog, by going to "Search->Go to line...", by right-clicking a Sub/Function/Label name and choosing "Go To", or by using bookmarks - a "back arrow" will be displayed right below the "File" menu:
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The back arrow won't show if you disable "Quick Navigation" in the Search menu.
That's that. What's new is that now in v1.5 you can use Ctrl+F2 as a shortcut to clicking the back arrow.