When I went to sleep last night the group I was in had just grown from ~800 to ~1500 after a merge. In my absence it grew to ~2500 and then ~4400 before Reddit crashed and the room was abandoned.
Just a few hours into the experiment several Greasemonkey/Tampermonkey userscripts were released that enabled auto-voting, among other features. The ability to mute users was also welcome, given how spammy the big rooms got.
There are auto-voting scripts that can be installed as plugins in Chrome and Firefox to help with this. I did exactly this last night and woke to find myself in the largest of the groups. It was entirely unfulfilling.