As for those who are about to do their first Disney running event, especially the half or the full, you won't be able to look at the place the same again. Besides going backstage in places, you'll start looking at even the on-ramps overpasses differently in that you'll be thinking, "I ran there" or that is where you got a photo op with a particular character. As for backstage, you'll start noticing the places to go backstage that you never noticed before.
It makes it more fun when you visit again, but potentially more annoying for family members....