I'm going to have to disagree with you guys on this one. We were in WDW the last week in October '02 and spent a day at MGM and didn't get to see/do everything. We got there for EE and stayed through Fantasmic. We did RnR, ToT, GMR, Muppets, Star Tours, Indy, B & B, Mermaids, One Man's Dream, and I think that's all. I've yet to see Backlot Tour, Animation Tour, HISTK playground, Millionare, Sounds Dangerous..... We stopped twice for meals, a quick pizza at Toy Story and our dinner at Prime Time wasn't long at all. Oh, it was two adults and one 8 year old, so it wasn't like we were busy changing diapers or anything....my DGD8 can keep up.
This was only our second time at MGM. We spent a half day there on a short trip in 2001 because I'd heard it was only a half day park and we didn't get to see hardly anything. I was determined to see it all this time and still didn't get to.
Maybe, I don't know, this is just a thought, but maybe most of you have been to MGM so many times, you tend to skip the things that you've seen many times, hit your favorites and find nothing left to do. Maybe, MGM needs new stuff that you haven't seen before. But for someone who hasn't yet seen it all, it's way more than a half day park and even more than a one day park for those of us who hasn't experienced it all yet. JMHO