For the GF, if you have an Outer Building CL reservation, that's Sugar Loaf (SL). SL has two sides, one side faces the Courtyard Pool (which is a beautiful view) and the other side faces the Marina (also a great view). Some of the rooms on the Marina side also have a good view of the monorail and look towards the MK, but you can't really see it. You can see high fireworks from some select rooms if you look to the right.
Given the size of the trees surrounding the building and balcony configurations, some SL views are better than others. Rooms towards the 'middle' generally have better views (no trees/plants right outside) but you get a bit of noise from the middle atrium/lounge. Rooms towards the ends are away from the atrium but can have more plants in your direct view. I'm generalizing a bit here as it's variable.
Fourth floor rooms have dormer balconies, which some people don't like as they are smaller and let in less light. Some third floor rooms (on the end of the hallways) have dormer balconies too. All others are full/normal balconies.
This floorplan pic may help, this happens to be the third floor. The room I had in April was in red.
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Here was my view looking right...I could have seen high fireworks if I stuck my head over just a bit more. This was in April - it's more green now.
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Here's a view of the fireworks from the Gaspy's/marina area. This is just a handful of steps out the back door to SL, very easy to pop out here to watch. There is sound played in this area.
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As the PP noted, at Poly with a GV room you will be facing the Oasis Pool courtyard area, not towards the MK. But, the lounge has a GREAT view - arguably the best of any CL lounge on property (maybe tied with CR).
Here's a view from the lounge (I'm up against the glass in this photo).
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And fireworks at night. They play the music in here. They didn't this night, but I read a recent report of them lowering the lights for the show, which historically has been my only gripe about watching from here. FWIW, you're also just a few steps from the beach, so VERY easy to pop out and watch from there.
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Hope that helps!