The new policy of a charging a fee applies only to valet parking and does not even apply to a DVC member parking at WL or BW. Thus, there will be no charge, and you can also park your own car without using valet.
Note as long as you are going to the BW for a BW activity you can park in the main lot. They recently adopted a new policy (with a sign out front) that parking is prohibited for use by those just going to MGM or Epcot; that rule was particularly being enforced in the morning and afternoon as they are stopping people at the gate and asking what they are there for. There is a second lot across the street for BW to which that policy does not apply. It was interesting to see the result. During prior visits the main lot could often get quite full just by noon and the second lot would be almost empty at the same time. Now the opposite occurs, as the main lot retains a lot of open parking spaces and the second lot is almost full in the morning.