I told you back in May to expect this change to happen soon, and now it has been confirmed that the Despicable Me: Minion Mayhem attraction has indeed drops the use of 3D glasses and is now being presented only in standard, but very crisp, 2D projection technology.
Why the change? It seems this is becoming more of an industry trend as theme park guests seem to not only be getting a bit tired of all screen/projection based attractions, but especially so for shown only in 3D. The same trend has been in progress for even longer at your local movie theaters where the patrons have been voting with their wallets, preferring the more higher definition 2D theaters (like Dolby Atmos), over the formerly promoted 3D technology (Real-D, IMAX 3D).
To learn a bit more, I wrote an extended piece on this growing movement away from 3D projection technology for BlooLoop back on May 28, 2019 that is an excellent read if you missed it the first time around.