We went every 2 years when our daughter was age 2-16. The only place we ever stayed was the Polynesian. We LOVE that hotel. I could stay there and never visit a park at all.
Depending on time of year, pricing changes. Most standard rooms have a small fridge and I believe a microwave. We stayed in the Conceirge tower a couple of times which was pricier BUT, had a lot of extra perks such as light breakfast, lunch, dinner, happy hour and dessert. Food (fruits, snacks, drink) were available 24/7. Granted it was not 5 star food but it wasn't bad and we enjoyed it. We went to nice restaurants at Epcot and did character events.
We loved Polynesian because it was on the main monorail line. You could take the monorail or boat taxi to MK and that was SO easy with a little one to bring back to the room for rest time or get something you forgot in the room. They have a beach where you can watch the nightly fireworks from MK, the pool was nice, other water activities were available as well.
I've not been in about 5 yrs so I am sure it has changed some but it was worth the money for us to stay there. The Grand Floridian and Contemporary are on that monorail line as well and very nice. We enjoyed the beach atmosphere of Polynesian and loved the luau.
Enjoy!