I doubt that the OP meant going to WDW solely for the purpose of people watching. Sometimes, you just need to sit down and rest for a while. Today's generation would probably bury their faces in their cell phones. Others enjoy looking around and watching the world.
When I was a kid, I never understood why my dad would go with us to the mall, but choose to sit and people watch, while we went to the stores. As I've gotten older, I find that I will now people watch, when I'm sitting down to take a break.
There's nothing weird or creepy intended. It's just stopping to observe people as they go about their day.