Eg I type in "Ed"? It shows the URL to my "editions in solr" GitHub issues I've been working on recently. I vaguely recall an article I read months ago on CSS grid? I type "grid guide" and bam it's the first suggestion. The spreadsheet I made about user languages? "sheets lang". That vague API I can never remember the parameters to? Just type "/query.json?" And I get all my previous requests as examples!
I find Chrome's address bar has been way less reliable and much more frequently just gives me Google autocomplete suggestions -- even when I know that I visited a URL recently that should match!