I stayed at the Yacht Club and the Polynesian a couple of weeks ago. Their pools closed at 8:00. I was told by the front desk that you could still swim until 11:00 PM at the Yacht/Beach club pool and you could stay in the pool all night at the Poly. I was told pool closing only meant there would be no life guard present and if you swam after hours it was at your own risk. I don't know though, because at prompty 8:00 the Y & B club lifeguards were actually telling people to get out of the pool and chains were put up to keep people out and I never saw anyone in the pool after hours. At the Poly when I returned to the hotel late coming back from the MK around midnight, I saw at least 10 - 15 people in the pool there after hours. I heard pool closing to also mean the pool doesn't actually close, just the water slides. I know this doesn't really answer your question, but this was what I observed 2-3 weeks ago, confusing as it is, at these two resorts.