Are you planning on booking a garden view room at one of these resorts? Depending on season and occupancy, a complimentary view upgrade is not out of the ordinary. Sometimes it's even done by the room assignor before you check in. When you get to the registration desk, I would simply ask if any castle view rooms are available. You'll get 1 of 4 answers. Either it's a flat out "no" because of high occupancy, an offer to upgrade for the difference in room view rack rates, an offer to upgrade for a discount or a complimentary upgrade. Based on the answer you get, you can decide if it's worth it. This could be a double edged sword though. I'm not sure about the Poly, but at the GF, there are less than desirable castle views. Due to some foliage and fairly big trees, you could get your castle view, but it will be between a bunch of branches. If you had stayed with your garden view room, you could possibly have had an off center, but unobstructed view of the castle.
Just an FYI that sometimes you can make requests to your garden view room that will increase your chances of a castle view without paying additional. At the GF, you can request a marina view room in Sago Cay or Conch Key. The same price as a garden view and the castle could be viewable from your balcony. Corner rooms at the GF are slightly larger, have 2 balconies and will sometimes give you both a lagoon and garden view.
Tammi