Are you serious? Do you know about Vim buffers? The `:b` command? The `Ctrl + 6` command? The `m` and `'` commands? These commands alone make Vim a far superior multi-file editor than anything else I have seen.
Now if you add plugins like `NerdTree`, `CtrlP` or `fzf` to the list, I don't think there is any other editor on the planet with the exception of emacs that comes anywhere close to multi-file editing productivity that Vim can offer.