- 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.
- 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 ;-)