My family stayed at Breakers at Cedar Point last week. We did multiple days at the park. When we checked in, we were given "receipt like" printouts for each family member. These served as our ticket to the park each day and to get our drink wristbands each day. Needless to say, those generic white pieces of paper were very important. This is a step backward from where things were 20 years ago where you had an obvious ticket for each person for each day.
Also, when leaving the park and needing later re-entry, they take your picture and give you another very generic receipt-like printout to get back in. The printouts have nothing but a QR code on them, so as a family you have to keep them separate and write on them to identify which one is which person. I understand that this is more secure than the old hand stamp system, but it is a major step backwards in convenience.
I agree that all of this should be do-able using the app somehow.