As a fellow Passholder, I will say that I understand your source of dissatisfaction and I hope/imagine/believe that Disney will be tinkering with the number of reservations available in the different buckets. They need to have enough availability that if a guest arrives at the gate, ready to spend money (you as a Passholder has already spent it), that they can accommodate that day guest. But, they may not need such a big bucket of reservations for the day guests. They will likely be evaluating how many reservations to have available in each bucket.
I would recommend that you contact Passholder Services and let them know that you want that day guest availability to be added to the Passholder side the day before or something like that. But, I don't think arriving without a reservation is a good idea. What is that poor CM at the entrance going to do? They will likely tell you that you need to make a reservation to be able to enter the parks. I was on hold for hours to get my park reservations done. It's not like a non-IT CM can simply give you a reservation.