This isn't the answer, but Johnny Depp and family are/were there within the last week or so. Rumor was that they were staying a month but that sounds very iffy to me.
I think Elvis was no longer with us when the GF was built. Am I wrong?
On our recent stay at the WL, we had the President of Panama staying across from us. It was a bit of a PITA with all the security lurking outside our room for three days! It felt like we had no privacy. But still kind of neat to see him at the Concierge table.
President Bush was just staying at the GF when I was there. I was the one who posted a post about it (and another poster was there at the same time I was, as well and responded) and there were secret service all over resort! I posted it as my wildest WDW experience!