We lazy people don't take a minute to rate plugins when are working, but for some we just fall in the "I'll rate it later" attempt to rate it accurately, giving it some time to amaze us or fail.
It'd be cool there is a "reminder" that, for example, once x days have past with no plugin changes (uninstalls, deletion, new installs) or widget changes, it would remind us and go ahead and mark "it works" for all the plugins that are installed, assuming if no change registered it must be working fine. A bulk-rate link in the plugins panel would do it too.
Basically the system is probably already part developed since all plugin pages show how many copies are in use, right? so there must be some kind of communication from our blog to wp database. (at least that number is jus taken from "downloaded" totals)
This feature would benefit plugin developers and enhance the whole "extend" site.