McDonald's may not be healthy, but I've never had anything from one that was gross.

(As an aside, many restaurants aren't necessarily any healthier than fast food.)

There are a few items on the menu specifically aimed at adults who would be otherwise reluctant to bring their children.

Children do love their happy meals though. There wouldn't be a plethora of these fast food places all over the world if the vast majority of people didn't like McDonald's. It isn't healthy to eat at everyday, but every once in a while is fine.

about once a year is already pushing it

You could eat there all the time if you wanted. They do sell salads....