Similarly the HSM show (haven't seen it yet but friends went with their DDs in the summer - they said the show didn't really stand up to adult critical viewing, but that their DDs (5 & 2) were entranced.
a good tip is that you can still use your fast pass after the time stated on it just not before your time. This means you can collect the fass passes around the other rides/lunch/rests and not have to rush back to that particular ride for the specific time. You can only get them one at a tiem though so you'd have to plan your day to make the most of them and not spend too long waiting around. We took dd when she was 15 months and she LOVED it.