My wife and I ate at the Y&Y counter service portion in July and really liked it. We liked it because it did not serve the standard counter service fare, so it was a nice change of pace. Additionally, I found the portions to be fairly large, which I liked.
As others have mentioned, they do have only outdoor seating and we were there in July. Not many of the tables are in the shade at lunch time. In fact, my wife and I bounced around to about five tables as people left, hoping to find one that was cooler. We finally got one under an umbrella, but then a number of ducks were running around between the tables. I was not a fan of that.
While my wife and I table-hopped, we ended up forgetting our backpack at one of the tables. We didn't realize it until we got up and started to walk away empty-handed. I quickly flagged down a cast member, who went inside and in less than five minutes came back with our bag. We were relieved, although the most valuable thing in the bag was just our point-and-shoot camera.
Overall, I enjoyed Y&Y counter service.