I think it varies from park to park depending on what time parades/shows/fireworks are schedule for. I'm sure people try to get in a meal before waiting around for something to start.
I couldn't agree more! We always shoot to have lunch around 1:30 and then dinner after 6:30. We tend to eat breakfast around 7:30-8:00 and have a snack around 11ish so a later lunch works for us. Plus, I always get my dinner ADRs without a problem.