I'm moving this article back to Nancy Cartwright (actor) and making Nancy Cartwright a redirect to that page.  I'd rather Nancy Cartwright be a disambiguation page, but to minimize the possibility of further disruption and to give this discussion a more appropriate home, I think that's a good compromise for now.  That way, no matter what happens with Nancy Cartwright, we can be sure that Nancy Cartwright (actor) will always work correctly, and the discussion can stay on Talk:Nancy Cartwright where it belongs.  As for the value of two-article disambiguation pages, they let the reader (and editors) know that there is more than one person with that name, in a much more noticeable way than a hatnote.  It makes it a lot easier to check that links are made to the correct article, since ones to an unqualified name will show up in the various "links to disambiguation pages" reports.