My m+ dps went down 6k roughly. I agree they should have left EP to see how it did with just the bug fixes. It probably would have been enough and didn't mess with the feel of the gameplay all that much (I purposely avoided using the implosion/DC exploit since I figured that was getting fixed, so that didn't really impact me much). As relatively OP as EP was, it made the spec feel sooooo smooth to play. The best imo demo has ever been. Spec isn't nearly as fun to play with the lower EP haste. It's fine if there's an overwhelming proc; but yeah it's feeling yucky. Demo needed a nerf, no question; but this is a bit of an overkill. Actually never felt more disappointed in a lock nerf as this one in all my way too many years of playing.
Glad I don't raid Demo. Sad times.