My DH's & I's favorite spot to watch the fireworks when not in the park is from the pool deck at the Paradise Pier Hotel. They pipe in the music, which is a nice touch and you have a great view of the fireworks. You do not have to be a hotel guest to enjoy the fireworks from their pool deck!
We did the 4th of July fireworks 2 years ago and it did get quite crowded up on the pool deck (more so than any normal fireworks performance we have watched), but it was so nice not having to deal with DL crowds after the fireworks and just leisurely walking back to our car in the structure.
My tip, if you do the pool deck, to hear the music the best, the building that houses the bathrooms/old snack shop has the speakers on it, so you will want to try to be closer to that than the "tented" area closer to the hotel itself.
Have fun, wherever you choose to watch them from!!!