I believe moderators on Reddit like to think that they're that important and integral to the site functioning smoothly, but I think the reality is upvoting/downvoting/reporting works perfectly fine in nearly every subreddit.
The only time it doesn't work is in places like r/AskHistorians or r/science which require high quality comments much like this place. You might argue with no moderation the subreddit would turn into a cesspool of reposts and memes - but who really cares? If that's what people want and that's what people are upvoting then let it be. There's no reason to have editorial control over subreddits when the entire point of the subreddit is to have stupid conversations, memes, and jokes. If people keep upvoting and enjoying the same stupid memes and jokes why do moderators feel like they need to step in and disrupt what the people find enjoyable?