Personally, I really don't think it's that out of line to suggest that this information could be used by people other than those planning their WDW vacation. This thread is already coming up on the Google search for 'Disney World park entrance security.' It's not that paranoid to suggest that someone planning an evil act might come across this thread. This site is accessible by everyone, not just fans.
They might also come across the thread you quoted or any number of threads from this and other sites. Would that make it any better if, God-forbid, something were to happen at WDW and it came out the perpetrator(s) figured out how to thwart security measures online? Would the response really be "oh, well it was posted elsewhere too"?
Speaking broadly, people should exercise caution in sharing information about security practices whether at WDW or anywhere that might be considered a target. That said, I don't run this site and don't pretend to, but if I did, I'd certainly prohibit conversations of this nature for the reasons described above.