Depends on the website. If it's a website where all the info is public, like a government website, I don't depend on the website search; it's usually horrible. I just use Google with the site: keyword to find what I want. If the info I want is part of my account, or otherwise private, then I use the website navigation, only resorting to search if I can't find what I'm looking for.

Was trying both today, to change passwords. I think drill-down was what finally worked.

I used find often to jump to parts of sites or documents where my relevant keyword is.

I mostly use navigation. I very rarely use find.