My wife and I are doing a WDW trip starting this Thursday and are doing one day at UO (park hopping) mainly for DA. We were UO passholders back in the day (2005-06) and went in 2011 to do Hogwarts. Was blown away by it and from what I've seen, am expecting the same from DA.
I've done some spoiling and watched POVs for both Gringotts and HWE as well as complete walkthroughs of the entire park (mostly to psyche myself up). Honestly, I think I'm more excited about HWE than GG (though both look like a blast and i can't wait to experience them in person). IMO with both areas, UO has really upped their game, upped the standard and done an incredible job.
That being said, I don't see how you can say that HGE is larger in scope, more immersive and more technologically advanced than anything Disney has done since Epcot. More technologically advanced maybe, only b/c it is brand new. More immersive than most things they've done, sure. Scope, OK it connects to parks, but the ride itself, from what I've been told and seen, is pretty short and fun but not really e-ticket in scope.
But look at technology (relative to when they originally opened) on rides like Everest, TT, Mission Space, ToT, Dinosaur. Look at the immersive, detailed theming on Everest and ToT (both built after Epcot opened). Look at the incredibly detailed theming in New FL (the whole area).
Everyone is entitled to their opinion and I'm not advocating one park over the other (I said how excited I am to visit DA and how blown away I was by Hogwarts), one ride over the other, etc. All I'm saying is, if you expect "pixie dusters" to give UO its due and give it a fair, objective assessment, you've gotta be willing to do the same for Disney.