I wholeheartedly disagree. I think this land is exactly the type of design that we've seen too far, few, and in-between as of late - something whimsical, fantastical, and joyful. I enjoy all the lands you've mentioned above, but I think it's not an apples to apples comparison as each of the lands you mentioned still feel real and accessible to a degree. Even the most 'alien' of lands - GE and Pandora - still are rooted in a sense of realism. Meaning, GE looks like some desert landscape, simply with alien carvings, while Pandora looks like a jungle with a gentle alien touch (the floating mountains illusion never sold me). Meanwhile Africa and Asia are reimaginings of literal real places, and Cars Land is literally Route 66.
Zootopia isn't any of those things. And where it differs from Toy Story is 1) it's level of interactivity, which adds to the immersive factor; 2) the sheer vibrancy of the land, and 3) it's lack of saturation in the parks as of now, which I think affects how we perceive it's quality.
Let's not say "very cartoony" as if it's a bad thing in a park primarily based on cartoons.