I regularly get in at 7:45 with an 8:15-20 ADR. I preorder and usually end up seated well before those with 8:00 AM reservations.
If most of the other lowlife non-entree ordering, inconsiderate, pre-opening ADR booking cheaters are anything like me they won't be hanging around taking up a table for long, not when meeting Anna and Elsa or a ride on 7DMT is at stake. Either we're selfish scum who are taking advantage of a loophole to get a leg up on the poor, innocent rope droppers or we're jerks who want to sit for hours in a loud, crowded room (a very nicely themed loud crowded room but a loud, crowded room none the less) while spending the absolute minimum. Can't be both.