Very much agree with this, I searched everywhere for tree-related keyboard shortcuts and only found out about them because of https://orionfeedback.org/d/7601-close-tree-shortcut/14
Trees are a great idea, so more and more discoverability will help adoption. Even if it's true that the menu will be big. That's ok. The Develop menu is gigantic. When I opened it I didn't get scared, I thought, "wow, nice, look at all these features I should explore when I have time. I didn't know Orion had this much focus on developer tools." Or look at an Adobe product's menus... 