With these search keywords, I've cut down on my general purpose search engine use dramatically, maybe 90%. Most of my searches through ddg/google used to be searches I intended to land on a known website with, so with search keywords for the search functionality on wikipedia, documentation websites, etc, I have been able to cut out the middleman.

Also, people slag on wikipedia's search functionality a lot, but I've found it to actually be pretty good even with imprecise searches. For instance, I forgot the name of Lubyanka, but searching for "KGB prison" found it: https://en.wikipedia.org/w/index.php?search=kgb%20prison