Hi! Are you staying at AKL? If so, I was told by the concierge staff there that all I had to do was ask for the fridge. They are not automatically in the rooms. They probably are in the suites, but not in the Deluxe rooms.
Polynesian has refrigerators. When we stayed at BC, there was none--there was a mini-bar though--we only spent a couple of nights there, so I'm not sure of the policy at BC. BWI, we had a jr. suite and there was no frig--but it did have a VCR.
GF has a stocked mini-bar but you can also get a small refrig delivered. Ours was no charge but I don't know if that was because we needed it for insulin?
When we did the "mini-concierge" on the 12th floor of the Contemporary, we had to aske for a fridge. There was no charge for us though (usually $10 per day I think for the other floors).