I love this service. I love pictures but I don't like carrying my camera and my phone battery didn't last long enough in the parks to be reliable.
My children love California Screamin' and did the Single Rider over and over. They learned where the camera was and did silly poses each time. We never would have paid for those separately, but with PP+ they are "free".
And our ride photos on Splash Mountain with my brother's family and the cousins is now a family treasure. (Two pictures actually - one log with the girls and one with the boys.)
And of course you have to get the various shots in front of the castle. My daughters loved posing for the magic shots of them holding the balloons. And I have some precious shots of myself and DS12 when just the two of us got up for EMH while the rest of the family slept in.
My DD8 did her own photo shoot in Carsland by RSR. We were relaxing with dinner on the back porch at Flo's and waiting for the lights to come on. She took her card and went over to the photographer and got lots of good shots just of herself. It was a good example of independence.
Make sure each member of your party has a card so if you split up and a PP+ opportunity comes up, you can take advantage. And then you just add all the cards to your account when you're done.
Just make sure you take a picture of or write down the PP+ card number AS SOON AS YOU GET IT. We lost our first card the first day and it was very time-consuming to recover the pictures that we'd taken with it by sorting through the date and time of the spots we'd gone. If we'd had the card number, it would have been a lot easier.
Final tip. Note down the date/time/location of all your PP+ sessions, including ride photos and character meals. Taking a picture with your own camera can work as backup. And then don't wait until your last day to review your pictures to see if any are missing. If they are missing, with the date/time/location, you can find them by going to the Camera store (one in DL and one in DCA) and they will help you. But, as I said, this is very time consuming and must be done during park hours. So ... plan ahead.