I will try to explain but I am sure there are many who can help.
When you first arive at the park get a park map it list all the rides and shows.Next to each ride is a box which says Express Entry. Any ride or show that accept express you get FOTL access. Go to the express line at the ride and show your room key to the attendent and procced down the seprate line to the front. We never had to wait more than 5 min. One other perk you also can use your room key at several resturants at Citywalk to get past lines waiting for tables .It worked at Hard Rock Cafe and Nascar.
Have a Blast!!!!!!!!!!!!!!