We stayed at CR and Poly both with MK view recently.
The CR has the best view into the park, as you can see from the posted photos. No doubt about that. From our balcony with my telephoto lens, I could see right down the bridge into the front of Liberty Square, the castle stage, the WEDway People Mover, and other details in Tormorrowland. We saw a monroail being brought from the "barn" onto the side track and switched into the main track. Every monorail in the MK circle was stopped during this several minutes process, and it was fun to watch.
But with the balcony door open, we also heard lots of bus traffic day and night. At times it was annoying when several were coming and going at the same time with roaring engines and backup beepers. And yes, you do see the CR parking lot, though it's easy just to overlook it while you're entranced with watching the MK.
The Poly has a nice view of the castle, Space Mountain, and the top of Big Thunder Mountain. At Christmas time you can see the top of the holiday tree, too. From the 3rd floor, of course, you'd see a bit more than on the first floor. Though you don't see into the park, there isn't any noise from buses. You would here boat horns from the ferry boat and the small resort boats.
It's been a long while since we stayed at GF. We did have a water view in Big Pine Key. The castle and tops of other attractions were visible, but they seemed fairly far away (as they do from the Poly). From Big Pine Key 5th floor balcony we could see the top of Spaceship Earth at EPCOT too, but only because we knew what to look for.
We're looking forward to CR again sometime in the future, because the view is so intriguing.