Report from the field:
ADR for H&V 8:05 for day with 9am park open. Level 8 Crowds.
Couldn't have been smoother. Arrived 7:15-7:30ish, got in far left line for early food reservations folks. 7:45ish, they started letting food folks in. After entering and heading to food, just past restaurant to tabled near Indiana Jones store. Only a handful of families there--likely early diners who were before us in line or possibly VIPs. Got our first choice Jedi show. I think we were numbers 4 and 5? This was all on a Monday, crowd level 8. By the time we left breakfast (still before rope drop), line was LONG for Jedi, from the first non-VIP, non-early-breakfast folks.
And then show went well. DD5 was sort of all over the place, but liked it. DS7 was over the moon. Or so I thought. Later told me it was only his third favorite thing of the day. After Toy Story. And buying a souvenir in the gift shop. (What did I expect: "Thank you, Mom, for sweating blood over this, I will remember it always"? Hardly.)
I saw on Kenny the Pirate that maybe they are not always going to do an early sign-up for VIPs and early diners, on a low level crowd day. So can't count on it. But it worked great for us.