• 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 ;-)