Total load time for the front page, all widgets, and also the WP Widget Cache writing them to disk:
86 queries. 1.314 seconds.
Total load time for the front page and just WP Widget Cache reading the widgets from disk (no individual widget cache has yet expired:
45 queries. 0.191 seconds.
The queries have pretty much been cut in half, and the load time cut down in much more than that. Sometimes the number of queries/load time increases a little, because some of the widgets have expired their cache and thus must be regenerated, but otherwise the page just loads quickly.
WP Widget Cache: made of win.