You can definitely wear UGGs to the parks, I wore mine for 3 days of intense touring at Tokyo Disney and they kept my feet comfy. I had no problems with them! If you wear UGGs at home, I don't see them being a problem in the parks.
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Disney World doesn't have any specific rules about what shoes can be worn and where — except for one! The rubberized clog-style shoe made famous by the Crocs brand is prohibited on escalators around Disney World. No Crocs on the Disney Springs parking garage escalators, please!
We suggest you dress comfortably, wear good walking shoes and check the local weather report before you leave for the parks at Walt Disney World Resort. Proper attire, including shoes and shirts, must be worn at all times. The parks are a casual, family-oriented environment.