Another person who grew up with the OG chiming in. I personally love the new opening. It works for me because I've played the OG who knows how many times at this point, and I'm really itching for something new. Finally getting to see the upper plate, and to see regular humans living their lives in the shadow of the mako reactor gives me a whole other level of immersion. I also love how we get to see the environmental devastation from the get go, from the wastelands, to the bird, to the dog, to the wilted flower. We don't need to just take Barret's word for it.
I love the music too, which is foreboding af, and it gives the opening moments of the game a level of tension that I think wasn't quite there in the original. The best part about the music is it works even if you don't know the significance of the lyrics; it's just so ominous and at odds with the seemingly idyllic scenes of kids playing and people going about their daily business. So I would argue that the new opening isn't just for returning fans. It's for new players, too. Something is not right in this city, and we feel it more than ever.
I agree that the buildup the Aerith's appearance changes the dynamic of the opening. She is no longer the first person we see, and that's a little disappointing. But I'm willing to accept the tradeoff for what we get.
I guess I should probably gripe about something, since I'm in this thread. So here we go: Chocobo Chick is an abomination. Just. Why?