Yeah the search and filter features of the outliner are often times overlooked. For example if you uncheck object children it won’t show any children objects. Something I run into is getting blend files that have a lot of collection. Like hundreds…well maybe not hundreds but it feels like it. So I’ll start organizing it by unchecking objects so that all I see are the collections. Then again I haven’t done that since someone introduced me to collection manager. I don’t leave it on, but when I have to organize a blend file’s collections I find it really helpful.