"uncontrollable hordes" That's a description I never saw coming. Almost like describing people as zombies.
Theme parks run in the model that you don't turn people away.
You immediate delve in the "huge drain on resources". I guess Disney must conserve their resources so smaller crowds are better managed and big crowds fend for themselves. Unless, of course, they know what they are doing and the resources are deployed correctly.
People are using their APs exactly as intended. The idea of not using an AP on a non-blockout date is the equivalent of the guest giving away their money to Disney when they haven't realized the full potential of the ticket.