The Page Explorer sidebar makes navigation simple (assuming you have organised your content well) however there is one annoying aspect and that is that when you load a page the explorer sidebar is not 'sync'd' - it does not 'show' the user where they are. This means that is the page open is a sub-page of a section that is not open you do not naturally see where you are. The breadcrumbs help but for me this should be a natural part of the functionality and is an important aspect of usability.
I don't know if Notion watch this site but it would be nice to think this can be added to the roadmap (or perhaps there is a way of requesting this)
