I'm not judging your for it, but to me that sounds like learning the violin by plucking the strings like a guitar. You're increasing the learning period by following old habits which may even be harmful.
I think it's better to just use the new editor sparingly, learning what you need, then switch fully once you're comfortable. A filetree is never necessary unless you're actually exploring and a file manager would be better for that. Vim has global search with `grep` and the terminal is available through `ctrl-z` and the `:terminal` command.
I've seen people touting Neovim setup that are just making things complex and fragile for no reason.