Sure, for a skeezy site. The parent was talking specifically about php.org, I can't imagine any real risk for a site like that exposing their visitor ip log.
It's not just that. You can get an idea of the traffic to the site if you watch for a while. When that information might be commercially sensitive then it could be a genuine issue.
For example, nba.com has been averaging about 3 connections and 1021 idle workers while I've been watching it. That's perhaps less traffic than you might expect? I don't know, but if I were paying for ad space I might be interested.
AOL deidentifed search data still allowed some people to be identified. When name is tied to some medical condition related search terms, it gets embarrassing...
http://www.apache.org/server-status
Additionally, mod_info is enabled, which lets you read nearly the entire running configuration:
http://www.apache.org/servinfo