I found this video while I was searching Youtube for no reason. It shows the park in the off season. It isn't much, but if you notice in the congo section, some stuff from Halloween Haunt was still up at the time.
There is a story about Walt Disney, which is that he used to get up early and drive his miniature fire engine around Disneyland before anyone got there, alone. This story usually leads to the quote about how the real reason Walt built a Disneyland is because he wanted one.
There is a less flattering story (which is disputed) that he once told someone something to effect of, "Disneyland would really be something....if we could just get all these people out of here."
Having worked at KD, it really IS kind of creepy to walk through some areas that normally are populated by thousands of people. But you get used to it after a while. (Sometimes, though, in the back of your head, you can hear the screaming of people riding any given ride, even though that ride is dormant at that moment.)
Walking through a park that is closed at night is VERY CREEPY! When I went on my first Theme Park Review tour two summers ago we were at Funtown Splashtown and we received an hour of ERT after the park closed on their wooden coaster. Well The only lights on in the park were at the wooden coaster and the entrance. I walked all the way to the water park to use the bathroom by myself. It was very eerie and surreal. To see the rides just sitting there completely still where just 2 hours ago there were people every where.