I followed this advice last Friday and had a great view! I was right across from Jumping Jellyfish, and could have sat on a bench if I felt like it. It was very empty (but it had been raining off and on all day, was cold, and the parks were relatively empty)
The bonus was that it was done in "my" area first, so I could have walked to the side of it, and gotten out of the park (going around Grizzly River Rapids, past Soarin', and out) before it even got to the end area (Sunshine Plaza), if I had felt like it, to go get a spot for fireworks. As it was I dawdled, walking behind the parade and taking pix of the Sunwheel at night, so I didn't get out until it was 3/4 done at Sunshine Plaza...
Anyway, it's a good place to watch it from!
But be forewarned that, well as of this weekend, they have the PP area blocked off so you can't go from Screamin' to Jellyfish (or vice versa). You can get to everything BUT Screamin' from the Jellyfish, but if you want to get from over at Jellyfish etc to Screamin' you have to walk ALL the way around.
I almost bumped into the construction walls b/c I wasn't paying attention.