I don’t believe there is an alternative file explorer similar to the Wikipad page tree, building up over non-hierarchical connections.
The alx-folder-note plugin allows you to associate a page with a folder, so as to simulate a page-node. But the tree remains static, the sub-pages located in their fixed place, reflecting the arrangement by folders. Obsidian’s graphic view somehow absorbs the loose form of the connective tree.
The mixed-sort-plugin allows you to sort folders and files indifferently. This can possibly complement the concept of page-nodes. But I see bugs when I create new pages or new folders.
To be on the safe side, I didn’t test these plugins on my note vault, just on a test vault with a reduced number of pages.
Alx-folder-note looks stable.
I try to apply Dor’s suggestion in my own work, despite having difficulty without a tree list view.