I agree completely! That scene with The Flash and then with Cyborg as well once as he was accessing and inside the Unity were excellent scenes that I can't believe were cut in the theatrical version. The ending fight scene was so much better too with how brutal the beat down on Steppenwolf was. I can't say I expected any of that ending sequence to happen at all, but I'm glad it was in there. Aside from the Amazonian music, I thought the overall change in the soundtrack was really good as well.
I'm curious how raw the original footage was. Some of the ending scenes were spectacular. If all that CG was already done how much money was on the cutting room floor in man hours alone?
And yes I have the Amazon/Halo theme burned in my brain right now.