I'm also a millennial and I have seen it but mostly because of my younger sister. I never really understood the appeal. I do enjoy them for the sake of seeing rare characters but I have no connection to powerline itself.
I also qualify for the millennial crowd. Let me tell you, as a parent of boys, watching them grow up and need me less, the line Max: “I have my own life now!” Goofy: “I know that, I just wanted to be a part of it.” hits me in the feelings like a sledge hammer.