I think it's the opposite. I think the AP's that are making the parks that crowded. Ever since they started the monthly payment program, there's A LOT more people with Disney AP's.
I used to have a reputation for being the Disney guy and used to hear about how I'm always at Disney and would get asked when am I going to Disney next (to them, even Universal is Disney). But, as a theme park lover, I saw the value in even paying full price for APs years and years ago. I've had a Universal AP straight since 2002. Disney, I'm Seasonal on and off depending on offerings. Now, on my Instagram feed, somebody I know is always at Disney and visiting the parks more than I ever did.