Downvotes, though, I have less issue with. They can sting, sure, but they're a signal from the community that "we do not want to have this conversation here." And that's fine! Not all communities need to have all conversations, and while moderators moderate, communities really do tend to define themselves. Moderators can say, for example, ducks are an allowed conversation topic, but downvotes from the community indicate that the community really does not want to discuss ducks. "What is permissable" versus "what is encouraged" are different things.
The biggest problem I have with downvotes is how they can be gamed. So long as that's dealt with reasonably, yeah, don't mind 'em so much.