I guess I'm a double minority, because I've never particularly thought much of POC (sacrilege!) -- to me it was just a place to cool off and try to figure out what the big deal was to so many people. Also, I've never seen the movie with Johnny Depp, and probably won't, unless they show it on a plane.
I rode last Sept before the change, and a few weeks ago after the change, and it's not changed that much, from the point of view of a casual rider. I agree that they've cleaned it up a bit -- the mist screen is great and I definitely heard "rough waters ahead" PLUS "dead men tell no tales."
The sound quality was so bad in the cannon scene last year that I was very glad that that got overhauled.
The JD animatronics were good, but they don't overwhelm. I do think I heard the name "Jack Sparrow" whispered so much that might be distracting if you don't care for him.
Other than that, no big deal.
I noticed they also significantly cleaned up Peter Pan's ride since last Sept (05) - it was a disgrace when I rode it that trip, with debris all over the place and physically dusty and dirty elements, plus dark cloth pulled aside showing behind the scenes stairs.
I'm glad when they take a fresh look at rides, whether for content or upkeep, and address them.