I have been to WWK numerous times each season since the Platinum Pass was invented by Cedar Fair. Every time I make the 45min trip, the place is packed. It didn't seem to matter if it was a weekday or weekend. In fact, the Monday following the 4th, an employee said that day was busier than the entire holiday weekend.
I have noticed a small difference in how the park is maintained since Matt Ouimet took over CF. Not that this change had anything to do with it, but gadgets that were broken in the lazy river or childrens complex are now operational.
Still hoping for that new slide complex...