I wonder if anyone is ever swayed by opposing opinions or if everyone's mind is made up.

Personally, I wouldn't mind leaving ALL of the kids with a trusted person (such as Grandma)

and going on an adult-only trip. But I would NEVER leave one child and take another on a vacation to WDW. Not unless it was a very short trip AND one parent was staying behind too. Teaching children that they have to consider the feelings and needs of their younger siblings is a life lesson that I wouldn't want to skip.
The part about having to split up to enjoy different attractions just isn't true, in my experience. Many, if not most, of the attractions can be enjoyed by all ages. I guess there are always exceptions, such as an especially fearful child/baby who just wouldn't enjoy any of it. Or, if DS and parents want to spend the entire trip ONLY visiting the "big rides" and ignoring the rest of the parks.
But, Disney has thought of this exact issue and more than solved it with the "baby swap". Reality is that your DS10 will get to ride the "big rides" more times with less wait by using the baby swap than he would without it. And now that Disney gives you a baby-swap pass, you and DD will be free to enjoy something "baby-friendly" while DH and DS take their turn. Then you and DS use the baby swap pass (with no wait) and DH and DD have their time. This is especially true if you are planning to go during a crowded time at the parks. Yes, you will be split up for short periods of time but it's not as though you'll split in the morning and meet up for dinner. Plus, the whole family will get to enjoy the stuff that can be done together as you make your way through the parks. Potential problem - Will DD scream "bloody murder" and not be willing to let you and DS go ride Splash Mountain? If so, maybe you will have to leave her with Grandma afterall...
I have to say that the theory that someone always mentions that babes are "too young to remember it" only holds up if you are planning one trip to WDW during your kids' childhood. Otherwise, it seems silly (to me). If it were true, why bother with the youngsters at all until they're at least two?

No sense celebrating First Birthdays, First Christmas or other Holidays, since they won't "remember it". Maybe not, but they sure do enjoy it AT THE MOMENT and YOU WILL remember it.

And what precious memories they will be.
Caveat - Everyone is different, all situations are unique, parents know best for their own families (or at least we try

). Good luck with your decision and have a great time.
Jackie
