I wound up doing the same thing (not with Janus, but with a massive forked .vimrc).
One day I was SSH'd into a remote server and vim'd a directory by accident and I discovered Netrw. It wasn't the same as NERDTree, but it was good enough for me to get rid of that plugin. Eventually I just learned to enjoy the defaults with minor tweaks. Today my vimrc[1] is < 200 lines, mostly comments and navigation shortcuts.