Just to be clear: Storybook, Casey Jr., and IASW are usually not open during the MM hour. (Those three would open at DL's regular opening time.)
Last July, our experience was similar to Mommy2PrincessAbby's. (Last July wasn't very crowded, since both SoCal APs were blocked out.)
We got in line at the security tents at 6:30am, and from 7:00 - 8:00am we rode:
PP, Dumbo, Alice, Matterhorn, Mad Tea Party (Tea Cups), Mr. Toad, Carrousel, and Pinocchio (Snow White was down for a refurb).
It's probably better to ride Storybook before Casey Jr., but we rode both Casey Jr. and Storybook in less than 25 minutes (before 8:25am). And then IASW was a walk on.
(Somewhere in there we started collecting FPs -- was it Space or Indy?)
And then we entered Toontown when it opened at 9:00am.
We had a really good morning. In fact, we had a ... Magic Morning.
HTH