Then consider using DDG & '!w term', or some other method (searching Wikipedia, extension, I think Firefox has something engine-agnostic built-in) instead?

Oh I do use DDG. I think it might suffer from the same problem, actually, since now I'm wondering why I see Wikipedia results very far down in Google when I don't really use Google.

The comment above mention using !w in your search to look only in wikipedia since you say it is nearly always what you are looking for.

I would say at this point you could just use wikipedia as your default search engine.

Yeah, I do do that for those things, but when I don't, I've noticed a decline in quality.

You can add a keyword search in Firefox.