Paying for a preferred room doesn't mean you get to choose whatever room you "prefer" when you get there.
Paying for a preferred room at CSR means you'll be assigned a room in Casitas 1,2, or 3.
If that's not what you want, maybe you should change your reservation to standard and allow someone else who does want preferred (Casitas 1,2, or 3) to book it?
First, let me clarify - I realize just because I pay for a preferred room doesn't mean I can pick whatever I please - my writing that was more a play on words.
Second, when we changed our reservation from a value to a moderate, CSR was the ONLY mod resort available and the preferred room was the ONLY room showing availability to use with our pin code. I didn't request a preferred room - that was the only thing open so in order for us to upgrade that's what we had to take.
If, and all requests are an if, we should happen to be able to move to a cabana room, then hopefully this will allow someone else to have some pixie dust on their trip and get moved to that building without having paid for the upgrade.

would make everyone happy
I wanted to add here that I totally understand about the huge variety of "preferred" rooms. esp at the value resorts, the meaning has changed.
we booked a preferred rom at movies a few years back, thinking we would get fantasia. didn't realize how things had changed, and go a parking lot view in dalmations.
we really can't stand the touchdown section of sports, but the surf's up is really pretty, as is the pool.. we would book there, preferred, but some of the touchdown rooms are also preferred. yuck! hate the noise, the spongy "floor" etc. not willing to risk it.
I think a lot of people think some preferred rooms are not so great. you could get a 4th floor, parking lot view in the 50's. on the very end, and still have to walk back, away from the food court, bus stops, to get to the elevator. but a standard room on the 4th floor in the 50's could be one room down from the elevator, and a closr walk to the food court.
there are just SO many room categories now!!! you have preferred view, pool view, preferred AND pool view. in the moderates, you have the pirate rooms, the royal guest rooms, as well as water view, king, etc. (if you book a king room, royal guest, water view, your moderate resort is almost deluxe priced!!!

)
anyhoo, I understand this posters angst. hate to pay preferred price (which she didnt' want anyway) and then get stuck with a parkig lot view, which is hard to get to!.