Exact Match Boost is very simple plug-in which boosts your exact matches further up in the search results and therefore addresses parts of the Confluence issue 14910 .
When you search for usability those results will be first, not results which contain use, using etc.
Did you ever try an exact phrase search like "drum and bass"? You probably haven't been successful. Now you can search for 'drum and bass' and get exact match results boosted up (please note the single quotes rather than double quotes).
The plug-in slightly slows down the search speed. However the impact is such that most users will never notice.