We were just there in early September, and we stayed at both POR and the FW Cabins. Neither had a smell associated with the rooms. They just smelled like... nothing when we opened the doors.
The Deluxe resorts *do* have a signature scent associated with their lobbies, however this is never carried over to the rooms.
I have traveled my entire life, and from time to time I have encountered rooms where someone before me has been very careless with perfume or after shave, or some other scent. Most recently, while staying in Memphis TN, we had a room where the entire upholstered headboard smelled strongly of perfume. We had to change rooms, simply because it wasn't going to be possible to sleep with that; it was very overwhelming.
If you have a family member who is sensitive to potential allergens, you can ask for a special cleaning to be done prior to your arrival. You will need to have it noted on your reservation. If it should happen again, then I would work with a Concierge at your Resort to see if they can find you another room. At all hotels - Disney or otherwise - it's easiest to request a new room right after you check in; if you go check out the room, and find it unacceptable it is not at all out of the ordinary to return to the front desk and ask to be re-roomed, or minimally for the room to be deep-cleaned and the offending scent removed. (Not to mention that it's easier to move all of your stuff before you have unpacked and settled)