One thing that I found with an AP is that I go to the parks more. Not more trips, but more when I am on a trip - those short days at the beginning an and.
When I have normal park admissions, we may not go to a park on the day we arrive, and we never go on the day we leave. On arrival day we can get 6 hours out of the part if we go to an EMH park, but still you end up tired. On most days when we leave, we have to be out of the park by 11 AM or Noon. If we are on passes it is a waste of a day. But if you have Ap's, who cares? Go to the park for 2 hours if you want on a given day- it's not costing you any extra.
The OP mentioned that they were looking to do a day at UNI. Well, you could do UNI, and if you wanted, come back and hit a park in the night - if you have an AP. If not, then it is a waste of a ticket.
Just something else to think about.
I used to get AP's every year, but haven't the last two year (we have not been going as much) but we have a Nov and a June trip planned, so we will be getting APs again (of course the DVC rate makes things pay off a lot sooner)
-dave