Seriously, ever come in from the front to rope drop Ratatouille, only to have it break-down shortly before boarding, have your Guardians boarding group get called super early before your breakfast at the creperie? Up and back and up again! At least I got a makeup pass for Remy to use after my breakfast!
I run my errands as early in the morning as the places open, then stay inside AC during the hottest part of the day. It’s the only way to survive the heat.
As far as the walking, I agree with any theme park in summer. The sun reflecting off of the pavement is brutal.