We booked our vacation at GF last year with DVC points which meant they could give us whatever, really a garden/standard view. The only request I made when I reserved was a MK view, if possible, but she told me it wasn't guaranteed which I knew.
We ended up in Boca Chica bldg. which I think has the MOST views of Magic Kingdom and the Lagoon. Our view was amazing!!! We were VERY happy! We could see all of MK, Contemporary, and the Poly. All the rooms that are odd numbered, definitely view the lagoon and probably Magic Kingdom. The even numbered ones probably view the main pool.
When we rented a boat, we could pull right up to where our room window was and take a picture of it!
Good luck!