My experience from a couple of weeks ago : It was 7:45am with an 8am EE/EMH. We were headed to Tomorrowland to sign up for Jedi Training. We figured since we were close to the front of the line it would be a fun casual entry in to TL. A line was formed (20 in front of us, another 20 behind us),up to the security table. Everyone happy, ready to go. Security guards all smiles and pleasant. Strollers folded, tickets in hand ..... ready to hustle through security and up the stairs. And then .....8:01....... "Sorry folks....there is a delay. We'll open at 8:30". Why in the world did they wait til 8:01. Just seemed like it was the given time that they were told to make that announcement. Odd....
OMG ! Not the worse thing to ever happen, but it almost seemed pre-planned for that situation. Everyone grabbed their significant others / strollers flipped back open etc and speed walked on down through DTD. And by then the security lines etc were quite busy and full. Everyone was orderly, but OMG ! By the time we got to Jedi signups (and we went straight there) the first sign up spots were gone. Maybe they would've been gone anyway. In the future for us......if the line is it not actively moving / loading, we'll by pass it.
Also, on a side note be aware....the Monorail will close down during the day if its too hot out. No air conditioning except in the front and end car. CM's told us that mid day, its common to be shut down due to the heat. Check your apps.