I've just undone the mistake I made almost 5 years ago getting FlaggedRevs turned on for mw.org with no consensus[0].
The average review time was > 58 days. There were over 50 pages pending review (I didn't bother paging) The vast majority of edits are harmless/productive and don't need review.
You probably noticed me removing you from the editor and/or reviewer groups since they're unused now. Since FlaggedRevs is gone you shouldn't notice any net permission changes.
-Chad
[0] I'm not joking. There was a thread where there was little/no consensus. I then went on IRC and asked Brion and he said sure.