Answer: http://www.google.com
At this is true in my experience. Even when I know the exact title of a page, e.g., "CVS for developers," a wiki search may tell me "No page title matches" and then give me hundreds of "page text matches." The page I'm looking for often in the list (for "CVS for developers, it was number 42 -- see screenshot), but by the time I've scanned the firsts few entries, I've quit and gone to Google.
With Google, I can type
moodle "CVS for developers"
and press the "I'm feeling lucky" button. It will take me directly to the page I'm looking for.
Is this a MediaWiki problem, or is there something we can do (e.g., when adding documentation) to facilitate better searching?