The last time I was there, I drove through that neighborhood. It's a beautiful area, and I remember Universal installing sound walls along the top of their side of the hill.
I didn’t think the walls looked very good.
I can't imagine living in such a scenic neighborhood and preferring to look at a wall instead of having a view of the theme park below.
The whole situation just seems a little overblown to me. At that distance, I'd imagine the screams are pretty faint. They're not especially loud to begin with, and they have to carry quite a long way.