This is a cool idea and all (I was a longtime Listary user), but honestly, IMO even better than this ability is incorporating Everything into Windows/Explorer file/save dialogs themselves. I can't tell you how many times a day I have to navigate to a random folder across a handful of drives in some Windows/file/save dialogs (yes, I utilize Quick Access, but its usefulness only helps to a point).
My current routine is to of course pop up Everything and not bother navigating in the dialog itself, use Everything to search easily/quickly for the folder, then I use a custom Everything keyboard shortcut for "Copy Path", then alt-tab back to the dialog, paste it + {Enter}, done.
But even faster + easier + better than this would be
embedding Everything into dialogs themselves, which would not only make this effort/routine unnecessary, it would even trump the need (largely) for QuickSwitching -- because
QuickSwitch's effectiveness only really works if the folder is already opened. If the folder isn't already opened, then you're still having to trawl through the filesystem to get to the folder. Once you reach that folder, it's just as fast as QuickSwitch to Alt-D (highlight file path), Alt-C (copy), Alt-tab, Ctrl-V (paste), {Enter}.
Sure, it'd be nice to not have to bother with the shortcuts, don't get me wrong, but the downside is if you've got multiple projects + multiple folders open that you're jumping between, QuickSwitch starts to lose its usefulness. And again, the folder already needs to be open (or freshly accessed) for it to work ...which means you're still having to trawl through the file system, which you could've just done in the file dialog itself.
But there may be some utility in it that I'm overlooking or misunderstanding, so anyone please correct me if so. I'm not trying to argue this or anything.