Semantic search. The current search feels like it is barely doing something smarter than substring matching / basic regex. The search should be more like Google and less like matching substrings

Fair enough. The built-in search is terrible, it doesn't respect any of the regex filters you set up to exclude files and folders. I fought with it for almost an hour trying to get it to exclude png images, and anything in a 'media' or 'attachment' folder, and it never worked completely. Then I installed OmniSearch it just worked, instantly.