Cosmic Rewind is a phenomenally designed and paced coaster by itself. If it was outside it would still be arguably one of the best non-looping coaster in the world, but there isn't a ride (including TRON) where projections and scale add so much.
The music is also fantastic, but that doesn't sell this ride; it's the way you're flying around space in such a satisfying fashion. I've been to every Disney park in the world, but this was mind-blowing. It's also very, very long, which is much appreciated.
It shouldn't be understated. This is up there with Hagrid's, Velocicoaster, Rise, Shanghai Pirates, and FoP for most technically flooring attractions.
I'd put Ratatouille as the second-best ride in the park after Guardians, so for me at least, EPCOT's redo has been a massive success. Obviously, it's different than what it was originally, but it hasn't been that way since the 90s.