From what I understand they aren't getting too much use anymore anyway.
Bit, I DID revisit Micky Dees. The muffin was crisper. I don't think they even toasted the last one but, even toasted somewhat, it still seems a bit thicker and doughier than I last remember, which would be at least 6 - 8 months ago.
To me, what I liked about the McMuffin was the high filling:bread ratio. I think that's been altered.