One day yes, one day no. The first day we had a VERY abridged welcome show with no family of the day. The second day we had the train, characters, family of the day etc... I don't know what the reason was.
Things really started to pick up around 9, and after 10 most rides had substantial lines.
We really did get a TON done early, though.
Do you have FP+ for Mine Train? Most people went there; about 5 minutes after opening the line was back to Storybook Circus! Then at the regular 8 am opening most of those people headed for Mine Train. It was insane!
Meanwhile, we were walking onto rides like Space Mountain and Peter Pan.
Also, completely unsolicited advice, but if you have any interest in the characters, I highly recommend Kenny the Pirate's character locator app. Many of the early EMH times / extra times were not in the Times Guide but were on his app. We were able to meet a ton of characters by seeing when their next set would be and then arriving a few minutes early. As soon as the character is out, people flock to them like moths to a flame, but by getting there a little BEFORE they came out we got a jump on the crowd. Extremely helpful for busy times.