Between Main Street and Discoveryland, on the right hand side, the cut through that goes past Plaza Gardens - we stood on a fountain there and had a fantastic view.
(However it was winter so no leaves on trees - perhaps this doesn't work in the summer!)
We also had a very good view from near the entrance to Discoveryland
I watched the vid - I won't see these fireworks, which is a real shame, they look fabulous.