Mine expires October 11. I may be going to Dapper Day but that's looking less and less likely. I'm definitely going Dec 3 so I don't plan on letting mine expire. If I do, I lose the free parking and Photopass that's grandfathered in. I guess you'd get PP if you added MP anyway though, right? I have only used the parking once, ha ha, but it's hard to let it go anyway... But yes, the AP prices are getting to that point where you don't necessarily renew automatically, especially since they removed the renewal incentive. Next year is a big question mark for me until I see how things go with SW crowds.
OP, I somewhat disagree with those who say you can enjoy all of the GCH amenities without staying there. I will tell you it isn't the same; being able to hop on the elevator and go down to the lobby, restaurants, and so on is quite different from coming in from DTD as a visitor. We sometimes sit by the fireplace in our pajamas. We get our picture taken with Santa when we see the crowds are low, sometimes also in our pajamas! Last year we dressed as elves
It's true that you can visit and enjoy it, but staying there and enjoying it is much better IMO because you can do that many times a day. There is so much during the holidays!
Here I am last year with my sister. I'm in green, she's in red.