I have to share a story with OP, because it goes to show that you never know exactly how a child is feeling inside..
Last week we went to Crown Center in Kansas City and as we walked by the Crayola Restaurant DD(11) said "That place still makes me sad..." and I asked her why, since we had not eaten there since she was 6 or so, (there are other restaurants we just like better) but had walked by lots of times as we make it over there three or four times a year.
She told me that when we had taken a train to KC from our town about a 1/2 hour away we went there and she colored a fish on the placemat and loved it so much she wanted to take it back home on the train, so we did. After we had gotten home that day I do remember her saying "Oh, I left the fish on the train" completely deadpan, just informing me. Her memory is that she was absolutely devistated that she left it and it makes her sad periodically because that fun train ride turned into a bad memory for her. Over the years I talk about that train ride how it was just us and how fondly I remember it. She usually just says "Oh, yeah!" because she must not have wanted to make it a sad memory for me I guess.
Now, I have a 7 and 11 year old and we are actually planning to surprise the kids at the airport and I don't expect either of them to have a huge reaction, because, obviously DD does not wear her feelings on her sleeve, I think they also need to process the information. DS7 is slow to warm up so he will need to think about it some before it sinks in, and it will probably just manifest in him jumping around and climbing all over me at the airport. Do I want shrieks of joy, sure! If I don't get them though, I attribute it to being of a certain temperment or just being kids!
OP you know your kids, so if they are usually the type to get excited, then maybe you have a point, but I didn't discover how my child (who I know very well) felt until quite a few years after the fact.
If you told me, at 37 that I was going to Disney for the 12th time in three years I would be over Disney'ed myself!