I heard a lot of the "why bring them so young..." question too. And I used to respond the exact same way --
I will remember it!
We took each of our three kids for their first trip when they were about 2 1/2. Those were the best trips! We have had many subsequent trips, but that age (although it can be exhausting) was my absolute favorite. They were in awe of everything. We have some of the best pictures from those trips.
We have traveled many places and our kids may have been too young to remember them, but I can't see waiting to travel with your children until they may be old enough to remember the trip for a long time. Life is short. Go and enjoy. If they don't remember, you can still tell them the stories!
I haven't read this entire thread yet, but had to stop here and comment. I totally agree with you! We had the same philosophy as you, we wanted to have fun and see and experience things and places and didn't want to wait until our kids were old enough to remember it.
Now we did wait until our kids were 11 and 13 to do our first of four National Park vacations. However, we didn't wait until then so that they would remember it, we waited until then so that they would have fun and enjoy and appreciate the wonder around them in some of our countries most amazing places.
As far as Disney, our oldest son was almost two on his first trip and our youngest was one. Even though we live in NH, we have gone to Disney every year, sometimes 2 and 3 times as year as well as 3 trips to
Disneyland. Honestly, each trip has been amazing!! I am not sure if a perfect age exists.
At any rate, everyone should just do what's right for them and their family. There is no correct answer. Pretty much whatever age that you bring your child to Disney is going to be loads of fun!!
I would just more focus on the "in the moment fun" then the "lasting memories". Speaking from experience on our first western trip, when my boys were 11 and 13, they certainly "remember" going to Yellowstone, but in the ten years that have past since that first trip, they mostly remember Old Faithful, not everything else that we did over the two days that we were there. The same goes for others National Parks that we visited that trip. Same goes for our second western trip when they were 13 and 15. They remember the highlights. Now, the trip we did 5 years ago when they were 16 and 18, is still very fresh in their minds and they remember lots and lots of details. But time does dull memories, even for us adults!!