Do you mean the concept of up- / downvoting posts and comments in order to determine a suitable order, or do you mean the tally of all your up- / downvotes being displayed as a number on your profile.

As for the up- / downvoting, while it isn’t perfect, and it sometimes encourages people to only upvote things they agree with rather than being accurate, it is a pretty good metric to get relevant posts and comments to the top.

And as for the numerical tally… It’s easily ignored. I didn’t particularly mind it on Reddit, but I also don’t mind its absence on Lemmy.
Seeing the number go up on my individual posts gives my monkey brain enough of a dopamine boost