If you don't want anyone handling your laundry, you need to be there when the load is finished. Otherwise, expect it to be unloaded for you. You can use the laundry website to determine how much time you have left. Sometimes you don't have 15 minutes to wait for an inconsiderate guest to unload their stuff.
I take it you are not a
DVC member. The DVC laundry rooms can be very small for the number of villas needing them.