Will be staying on site for 1 night to enjoy express passes for our first 2 days at US and after will be moving offsite for our last 3 nights. If I remember correctly, been there over 5 years, you just have to show your pass briefly in order to use the express line entrance... I know that you keep your pass as a souvenir at the end of your stay... so how they know for sure that your pass is still valid???