I noticed that once I hit 3,000 rep and could vote to close I seemed to stop getting helpful flags. The behavior is different too. Before I would flag a post for being non-constructive or whatever, then eventually I would get a +1 for being helpful. Now, what happens is when I try to flag a post I get a "Vote to Close" button instead, and after clicking it, a "Your vote to close has been recorded." message. More significantly, my "moderator flags" count does NOT increase.
So, what is the story here? People who can vote to close no longer get credit for helpful flags?