It seems the navboxes have already slightly increased the average visit time and # of pages per visit. Only by a few % so far, but it'll take a bit more time before any trend can establish itself.I've created navboxes for the wiki, and every game mechanics page now has at least one navbox, with a few having two.
All the navboxes are featured on this page.
You can also see them all below:
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Hopefully this will help people find what they're looking for, and also make them browse the wiki for longer.