The immersion of Galaxy's Edge is totally the selling point for me. Where else can I go and experience what it would be like to visit another inhabited planet? I love all the ambient sounds, I love that blue and green milk taste like nothing recognizable, I love that it's aurebesh everywhere you turn. I think what we got is so cool because the imagineers put so much effort into transcending our expectations.
Of course their first thought was "what if we re-created one of the planets from Star Wars?" (you can read about the whole creative process in The Art of Galaxy's Edge), but they found that limiting and wanted to really blow us away with the most astonishing Star Wars experiences they could create. I respect that artistic process, I love the result, and I'm so grateful that they made this amazing place for us.
I'll be honest, I haven't been to the Wizarding World yet, but I don't think I could possibly love it more than Galaxy's Edge. I can walk down British streets with Medieval architecture, eat British food, etc. in the "real world." I can't visit Batuu anywhere else!