When I first saw projection mapping I was amazed, it was used for the Vancouver opening ceremony and I fell in love with the show they did, I finally got to see a live projection show at the Magic Kingdom just a year later. As much as I liked it it's now overkill. I prefer real props and affects like foubtains, fireworks and a globe that spins, opens with shaped led screens. Those are the kinds of things Disney was made of but now it seems like projections are on everything and to be honest I can be just as mesmerized with a computer screens as I am projections on a castle.
While a new tech can make something have that extra pizzazz for being new, in the end, it all boils down to: did they use the medium well?
There are good projection mapping (HEA on the castle) and bad projection mapping (anything on the Chinese theater in DHS because of obstructions and limited projection space and limited viewing space).
There are good AAs (Na'vi Shaman, Elsa, Wicked Witch [RIP]) and horrible ones (most of MKs PotC, most of Little Mermaid's fish on a stick).
There are good screens (Star Tours) and awful ones (Nemo ride).
There are good props (the whole stage of Fantasmic!) and bad ones (sorry, the the globe for Illuminations is way too small for the venue and its animations are barely discernible).
There are good parades (Festival of Fantasy) and bad ones (MSEP [RIP (please!)]).
Good shows, bad ones. Good movies, bad ones. Etc....
Whatever the medium, it has to be done well. If its done well, then the medium shouldn't matter much. I do understand if one medium is used way too much, but I don't see that as much of an issue with Disney. As much as people whine about SCREENZ!!, I'll whine about OLD LOW CLASS AAs!!