I've never done PPO, but I see the appeal. And there is another angle to that appeal: It depends on whether or not you want to eat before or after a few rides. I'm utilizing EMH on my upcoming trip just because it's me and my dad and we can eat whenever. That said, I recognize very few food places besides the Starbucks locations are open during EMH and it's really not worth trying for a PPO during these days also.
PPO is good to make sure you (and your kids) are not walking around on an empty stomach beforehand. With no one worried about food, you can just focus on the attractions as people have already mentioned with their experience.
The one caveat I have is that a park is not guaranteed to open after a PPO. And what I mean by that is the parks have changed hours before (and have done so just this year) to where they open earlier than the initial PPO reservation. I've seen people lament their PPO being ruined because of this. So just keep that in mind when you make the ADR.