Obviously this is a matter of personal preference.. For our family, a disney vacation is one that can only happen once every 3 or 4 years...at least.. While most of the reasoning for this is financial, I think that it keeps it extra special... Last time we went my DD (8) and DD(4) had a wonderful tme. I was pregnant with our DS and because of my condition, I was able to spend alot of time waiting while the others went on rides, and I observed many families... I made the conclusion that for us, we would not return until our son was 4...fully potty trained, a little more reasonable, yet young enough to still really believe in the magic.. There were countless times where I felt such pity for parents that looked so worn out at the end of the day with an exhausted baby and cranky toddlers...Now our son is 4 and he cannot stop talkng about out May trip. Like I said, it's definitally a personal preference and I feel like you can enjoy Disney with your child at any age..