We spent 5 nights Thanksgiving week at the Poly before moving over to HRH Thanksgiving night for one night. It was well worth it! We waited no more than 5-15 minutes for each ride (aside from Forbidden Journey and Rip Ride Rockit which don't accept Express Pass). Also, the resort is within walking distance and the parks aren't as spread out as WDW. We had a nice Thanksgiving buffet at the Kitchen and were able to go back to the parks after dinner. The parks are close to one another so it's easy to go between parks.
It felt like more of a vacation since we weren't spending a lot of time walking and waiting in lines. We planned Universal for T'giving and Black Friday figuring that WDW would be much busier and we'd be able to do more with the express passes. That plan worked well. We liked it so much that we are returning to Universal next month and are bringing extended family with us. I just returned from WDW yesterday with my DS's. My DH didn't go with us because he said that Disney doesn't feel like a vacation for him and that he only likes to go once every few years. He much prefers Universal. I personally love both.