No, HaleyB, there are no charges if you apply a discount to a reservation. What you could be thinking is that if you have a package and want to apply a room only discount code, you need to cancel the package booking and rebook as a room only. If you do this after your cancelation deadline, they do charge you a fee for canceling. I think it is 45 days before your trip, but since I book room only reservations I'm not sure about this date.
Ddank, yes, I understand that you don't mean people like me who need specific rooms for specific dates, especially since AP rates don't apply to some of my rooms. I just meant that some people might have to book early for these reasons too. I totally agree though that if you have no intentions of staying at a resort unless an AP rate comes out, then you probably shouldn't book a stay there well in advance, with holiday or peak times being exceptions. For our May trip, I am arriving a day early with a friend and we plan to stay at PC for the first ngiht before moving to our already booked 2 bedroom suite at the GF. I have not booked this night at PC yet, however, as I will be happy at an All-Star if PC is booked by the time the codes come out. Typically, in situations like this, we wait to book till the codes are out.
I'm not sure how much of a difference this makes in releasing codes, however, since someone pointed out that the general public doesn't always know codes exist. These people, I imagine, book months in advance, well before codes are out, simply because they don't know anything about codes and discounts. Also, michaela mouse, you can't compare how far in advance your parents had to book when you were younger, unless of course you are referring to the past 8 years or so, since when I was younger Disney only had a few resorts, so yes, you would have to book very far in advance in order to get any room on Disney property. Even in 1987, however, we were able to switch Disney resorts once we were there and it was during peak season (mid-March) and got a tower room at the CR with a MK view for 10 nights without a problem. Now that they have many resorts in many price ranges, booking years in advance is no longer necessary as long as you don't have to stay at a specific resort.