We have not used a GAC yet, mostly just FP. We have deliberately avoided some attractions, and do not try to go on any rides that are apprehensive. That has changed with time and maturity. We carry ear plugs to counter some sound or loudness issues. We have brought some toys and the like, to hold their attention in lines and restaurants.
We go to the Parks early, set a leisurely pace, have lunch, then head back to our Resort.