I spent quite a bit of time hiking in Zion and Arches and other American Southwest parks back in Autumn 2011 on a 4-5 month road trip bouldering in that area. Even spots like Angel’s Landing had almost no one there when I went.
I just don’t have much desire to visit them anymore even on their “quiet” days. I know the crowds are often manageable, but I prefer the almost no one else there places. Probably in part due to me being a “grumpy old man” now lol