Good point. Children don't have that logical thinking yet, or thinking ahead of time, so I presume they are interested to see what happens then, or they could just be amazed and don't try to understand what just happened.
I get that feeling a lot through programming and performing magic. When I run a program, I try to understand the logic behind it, and be amazed on how it happens. As for performing magic, I tend to be amazed at my own performance, which is actually weird for me compared to programming lol.