Nitro? Really? Couldn't they just, oh I don't know, use a fan blowing cold air that's being pumped from the show building's AC unit?
I don't think cold AC blowing could pull off quite the same effect of LN2.
A fun video of the Harry Potter actors touring WWOHP:
VIDEO: Harry Potter actors at Universal
The quick facts in the OP worry me. I'm not sure how this metric is decided or if it's accurate, but JUST to experience The Forbidden Journey (including the queue, whatever that means) is supposed to take an hour? Ouch. (I say ouch not only because that's a long time, but that's a long time in Universal. I got major attractions in both parks done multiple times using their paid "fastpass" last year during Spring Break in about 2.5 hours).
As for the technological innovation, I'll hold actual judgment, but this seems like a technological evolution of the Spider-Man ride, which isn't a bad thing, except for the fact that when I first got to ride Spider-Man (2009), the attraction had not aged very well at all. I hope this one ages better.
The theming seems pretty nice, but a lot of it is stuff that has had the groundwork laid for it in the films. Kudos to Universal for bringing it to life.
I'm curious how much the crush of people is going to affect enjoyment of that area, though. As neat as the experience at Ollivander's is, it sounds like that alone may take a long time to get to do and get done with before the crowds thin out.
I hope the loading system for The Forbidden Journey works as expected and that any kinks are worked out or easily fixable because, as far as I can tell, The Forbidden Journey and the Hogsmeade shops (which are reportedly fairly small) are the only "new" things guests are getting. That's not to downplay the massive achievement or the success that this part of the park will be, but it is an acknowledgement that this area is going to be absolutely CRUSHED by people, so I hope that Dragon Challenege and Flight of the Hippogriff can draw in people to keep some strain off of the showcase parts of the land.
As for stepping up its game, I don't know what Disney can do at this point. It sort of depends on how The Little Mermaid ride actually is in execution because that's been one of their major "E-Ticket" rides that's been talked about over the last few years. I think that, even opening in phases, the Fantasyland redesign will be executed better from a crowd control standpoint just because of the amount of space available. But the reality is that Harry Potter is a global phenomenon and a powerful property for Universal. They did well in their design and execution of the land, and I don't think that Disney can counteract that in a substantial way, even if they throw money at it and think "outside the box".