Just randomly clicking around I see that subreddits with ~50k users already qualify for Reddits top 5% largest subreddits.
If you randomly browse subreddits of that size you will notice that for many of them the newest threads are at least days old. So in reality the amount of active subreddits, let's say subreddits that get at least one thread per day or more, is probably in the realm of a few thousand.
Voting wise, all communities I’ve seen were pretty overwhelmingly in favor.
One of my favourite TV episodes is the Curb Your Enthusiasm episode where Larry thinks the weatherman is calling for rain so he can have an empty golf course. The thought definitely crosses my mind every time there's a big outdoor event happening and it's calling for rain.