I waited until my children were six and nine to take a trip to Disney.  The older one had been able to go to Magic Kingdom on a school trip, but the youngest had never been. If I'm perfectly honest, thinking of going to a Disney park was both terrifying and exciting. I found it terrifying because I imagined seeing all sorts of parenting practices that would upset my trip; exciting because for school age children the Disney parks are absolutely magical.  Both of these reasons kept me away and pushed me toward the parks simultaneously.