Just to give my experience from last night, it was exactly as painful as many have reported on here. There were 3 ships checking in last night and it was incredibly slow. Every click caused the circle of pain to spin, but I was slowly making progress. I had to do 2 rooms and I got a PAT of 11:45 for the first around 12:45 AM. Then things essentially crashed right before I got to the PAT step of the second room. I was on the last tab before PAT and it simply would not load. I had phone, iPad, and laptop all trying. Finally at 2 AM, I gave up.
I woke up around 4:00 and tried again. Worked with no problem and PAT of 12:15 was earliest available. This morning, I looked again and 12:45 is available. So basically all that stress overnight to get me 30 minutes.
It really is crazy that Disney doesn’t fix this or change the process. It was bad enough as it was but at least it was a Friday night where I didn’t have to go to work in the morning. If this had been a weeknight, it would’ve been even more disruptive.