I'm strongly against turning this off.

There have been times in the past when I have accidentally clicked the "Log Out" link instead of the "Quick Links" link (I browse the forums by using the "New Posts" link) and having the verification of whether or not you really want to log off has saved my bacon numerous times.

Plus I think it's poor usability to not have a "Are you sure you want to do this?" message when doing something irreversible, like logging out, deleting a document, etc...

Shame on your other forums for not having this enabled.