You can add http://perlmonks.org/* to your "Included pages" when you "Manage User Scripts..." in GreaseMonkey.
Subjective. I feel they are more user friendly as they are single-click.
I'll take a look at the voting booth. It must use a similar form to post-voting. Update: Looks like this is a JavaScript bug when calling document.evaluate on an XPath - appears to be picking nodes with similar XPaths! Best workaround is to disable the VB node.
You do save refreshes especially in the long run. You no longer need to refresh the page (by pressing the "vote" button) before moving to another node.
I must admit I was not expecting to please everyone ;-)