I can't help but wonder if reddit's still growing popularity is a contributing factor. reddit found a slightly better way for the community to moderate itself so they've been able to have a higher programmer to moderator ratio.
What way is that? Reddit's staff are intentionally hands-off and it really shows. In fact, the only successfully moderated subreddit of any significant size I can think of is r/askhistorians.
There are several well-moderated subreddits. AskHistorians, AskScience, and Science all come to mind. Even some of the very highly trafficked subs do amazingly well (yes, with some bumps).
And there are exceptions as well, as there is abuse. The ability for fringe interests to effectively hijack subreddits is a particularly troubling dynamic. See the case involving, of all things, xkcd discussion on reddit:
There are some interesting reddit rules which play into this:
• subreddits are considered community, not personal, resources. If a subreddit's moderator goes AWOL (fails to log in to reddit for 2 months), the sub may be assumed by another moderator. Note that merely failing to moderate a sub isn't considered AWOL.
• Once installed, moderators are not (or are only very, very rarely) removed by reddit admins.
• To clarify, moderators are ordinary reddit users who moderate subs. Admins are actual paid reddit staff who run the site.
• Senior moderators can remove more junior mods. There's no provision for voting among subscribers or moderators in the event of perceived abuse.
• The generally recognized remedy is to create an alternate subreddit with different mods. This happens with some regularity. You'll now find /r/xkcdcomic as an alternate to the original sub, and with a subscriber count approaching that of the original.
Why does significant size matter? Reddit has thousands of subs where users can congregate on a per-interest basis, which adds up to a huge total yet feels relatively relatively more cozy
MetaFilter's moderators are some of the most considerate and caring people I've seen on the internet. Sure, if you're approaching the site in bad faith they are going to tell you to take a hike, but they also put a huge amount of effort into working one-on-one with people through private messages. This is especially important when people are posting about difficult and sensitive personal issues on AskMe.
Programmer to moderator ratio is a pretty meaningless metric. I'd far rather see a great community with limited programming support to a fancy site with tons of new features and a toxic community.