We have been using our OF at WKRON for the last week of January and first week of February and have not had any trouble getting reservations. Now we avoid the President's day week, so that ios surely a factor.
The resort is "Full" (i.e. all rooms occupied) when we come, but not crowded. We overlapped with Presidents weekend one time and noticed a big difference in crowds at the pools on the weekend. My belief is that during the non-President's day week, the units are rented mostly by retired folks, so there are usually only two people in each unit. During the holiday week, kids are out of school, so most units have more than two occupants. It really makes a difference in the perception of crowding at the resort.
Greg