Really? Each Land of a new theme park opening this year costing more than a highly detailed land opening 11 years ago with one major attraction in it shocks you?
Again, we have to get real.
Disney spent 1.1 billion dollars on Carsland, over 15 years ago. It is not going to buy the same now.
Just like about 12 years before that the entire opening day of AK as a park cost WDW 800 million. Incredibly cheap by today' standards, even with its opening day line up being slimmer on major rides, when you consider how rich the environments are and all the animal enclosure venues, parking lot, infrastructure etc.
Value of the money listed does not stay the same my friend. Nor does it all have to be spent on theming. You got to hit all the targets for long term sustainability. 
Not sure where the park promised or stated that all lands would be like Diagon.
People come for the anchors of Nintendo and Potter, and then they enjoy the heck out of the surprise and delight of Monsters and Berk and then the Plaza of Celestial Park as a place for the larger thrill and charm. This was always what was talked about in creative.
EPIC spent their money pretty right, as evident by the hype not dying down anytime soon even with its flaws and a Disney Park would likely cost the same or more. Tron for MK has been reported to cost 250 million and we know how box like and mixed review that enclosed coaster is. And so many know how odd it was to see the numbers Martin provided for the cost of Fantasyland's expansion.