I don’t usually feel one way or the other about other people’s upvotes/downvotes.

But I try to use my upvotes/downvotes as a barometer for how well something I posted or commented on was received by the community. If I’m being massively downvoted, I will try to consider what about my post or comment warranted the negative reaction, and I might reconsider what I said, or at least how I said it. If something is upvoted, it does give me the warm fuzzies knowing that other people agreed with, or enjoyed, my content.