To give you an idea - Here's a shot I took from my balcony at the Contemporary this last NYE (non CL - Theme Park view)
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And here's one from my Polynesian room balcony the year before that - Hawaii CL -Theme Park View which cost me an arm and a leg!

(Note the cabanas were still being built so they're not lit up yet and they will be now. (The little white blob in the lower center of the picture is Cinderella's Castle.

) You can also get this view from the beach which you will be allowed on as you'll be staying at the Polynesian without paying for CL.
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You get a more straight-on view of the fireworks from the Poly