When Pete says you need to watch the fireworks from the water, you need to watch it from as far back as possible. It is truly amazing and it is truly a huge panoramic stretching from behind the Grand Floridian to behind Spaceship Earth.
I had to use an Ultra-wide lens on my DSLR to get the whole fireworks in the shot. If you are in MK, you will be having to pan&scan the sky to see it.