Almost all. And almost all of them have zero waits, except for Space Mountain Ghost Galaxy and Haunted Mansion Holiday.
And that speaks to the demographic who is there; they are a mix of tourists and locals, but everyone is there for the "party" and less so for the usual Disneyland experience of going on rides. Last year I left on a Friday evening as the party was starting, and on my walk out to the Uber station on Harbor there were seemingly thousands of tourists streaming over from the Harbor hotels and pouring out of hotel shuttles all dressed up for the party. Then there are all the locals who drive in for the night all dressed up. It's a very festive event, people really go all out on their "look" and outfits, and if you don't show up in costume you look like a creepy dweeb.
But it's really about the treat stations, the characters, the parade and entertainment, and promenading around the park all dressed up taking in the atmosphere and seeing and being seen. The rides are an afterthought, and thus they are mostly abandoned even though almost all of them are operating.
It's a weird thing, definitely a part of SoCal autumn culture in the 2010's, and one of those "Only at Disneyland" experiences.