I have used my discount to book club level rooms in the past. We take our children and grandchildren every year for their Christmas present. This year it was very difficult to get club level rooms. Nothing at BW, Yacht Club, Wilderness Lodge or Grand Floridian. We will all be at the Beach Club this year for the first week in December. If rooms are filling up with full paying guests then your chances of getting a cm discount room are very small.
My husband and I go a couple times a year and usually stay at the BW, but this year no rooms were available for many dates. We are both retired so can travel anytime. We have been staying wherever the discounts are and as long as I can be club level we are fine.
If your dates are flexible and you don't have your heart set on particular resort you will have better luck.