Tough to be a Bug is the best 3D attraction they have created. RSR is the best ride at DCA and Cars Land is the best themed land Disney has on the West Coast. Midway Mania is a hugely popular fun attraction, Astro Blasters was a highly enjoyed ride when it debuted. Nemo suffers from a bad idea (screens), but they did throw a TON of money at it.
I don't feel like Pixar has been short changed. If anything, its been the focus for most of their park additions in the past 20 years or so. The DLR hasn't had a new Disney animation inspired attraction since Pooh in 2003. Before that and the Tarzan overlay to the treehouse, the next earliest Disney animation inspired ride was Splash Mountain in 89.
Even if we look worldwide, we see a Frozen ride at Epcot and a Beauty and the Beast ride in Tokyo being the outliers.
And I don't really think Aladdin fits Epcot. I don't think Frozen fits it either, as both take place in fictional places and are not really indicative of their culture/folklore.