We just came back from a stay at YC this past December, our first at the resort. From beginning to end, it was a wonderful experience. The room was nice and every interaction with staff was great (save one total breakdown in service at the marketplace). For me, the MK resorts represent the ultimate Disney experience. It may be nostalgia, but I "grew up" at those, and there's still nothing quite like being on Bay Lake/Seven Seas Lagoon. After having returned from our last trip, I was pretty sure the cost of YC just wasn't "worth it", because the theme didn't make me feel like I was "in the bubble". Then, on another forum, I discovered an almost cult-like following for BC. It was amazing how much stronger a following that property seems to have. I just assumed they were basically the same resort but I definitely got a different vibe from those who have stayed there. So although I personally wasn't impressed with the way YC tried to pull off New England (didn't seem at all authentic, and totally felt like the convention center side of the resort), we're looking at making ressies at BC for our anniversary this summer.
2 cents