Most people whose eating habits I've observed over a long period (i.e. my family) use it much less as adults than they did as children. When I was young I dutifully glopped it onto all the traditional foods. Now it seems kind of gross: cloying sweetness with a hint of tomato sauce, and it kind of smells like cough syrup. Sweet is fine, and tomato sauce is fine, in the right dish. Neither of those flavors are appealing straight out of a medicine bottle. All the kids I know consume mass quantities, but most adults have more sophisticated taste.
Kids use it more sure, but most adults still eat ketchup, just on certain dishes like fries for example. That children over do something doesn't make it a child's food.
