Would love if strong votes came with strong encouragement to explain your vote. It has been proposed before that explanation be required, which seems terrible to me, but I do think it should be very strongly encouraged by the UI that votes come with explanations. Reviewer #2: "downvote" would be an unusually annoying review even for reviewer #2!
I'd prefer to limit or simply remove strong votes, or scale them to the number of total votes on a given post/comment. It's overwhelming to get strong votes as the first few votes. Of course, it's unimportant to get strong votes on already-heavily-voted items, so I think just doing away with them is best.