I know technically any ride that employs 3D was "built" for 3D, but some rides genuinely need it as part of the gimmick (Jimmy Fallon, Spider-Man, Transformers), for depth based on rendering (Kong, Avatar, Gringotts) or because the vehicles have limited movement and need immersion (Ratatouille).
When I look at Despicable Me, did 3D make it better? Sure. But in my opinion it uses the same ride mechanics and thrills as Simpsons - like when the vehicles crash into things. So I don't notice its absence as readily and nothing would be "off" to me if I rode it in 2D my first go around.
I get needing to remove 3D from certain rides to fight against bad reactions from guests, but I wish the theme parks wouldn't shortchange the experience for some attractions and would instead, be more strategic about it.
I guess my analysis basically shows there's almost no attractions left to remove 3D from except for maybe Star Tours (though there's an argument it's needed there too), but it's a shame we've gotten to this point.