Vim Explorer "no es un editor de comandos"

Cuando abro MacVim (instalado con homebrew) en la interfaz gráfica de usuario, el Explorer funciona como se esperaba. Pero si abro "vim" en una terminal, tengo que mensaje:

E492: Not an editor command: Explorer

Pero el netrw está instalado. Esto es lo que vuelve :scriptnames

4: /usr/local/Cellar/vim/7.4.712_1/share/vim/vim74/plugin/netrwPlugin.vim

vim --version

VIM - Vi IMproved 7.4 (2013 Aug 10, compiled Aug 14 2015 16:38:12)
MacOS X (unix) version

brew info macvim

macvim: stable 7.4-81, HEAD
GUI for vim, made for OS X
https://github.com/macvim-dev/macvim
/usr/local/Cellar/macvim/7.4-77 (1905 files, 34M)
  Built from source
/usr/local/Cellar/macvim/7.4-81 (1918 files, 35M) *
  Built from source
From: https://github.com/Homebrew/homebrew/blob/master/Library/Formula/macvim.rb
==> Dependencies
Recommended: cscope ✔
Optional: lua ✔, luajit ✘
==> Options
--with-custom-icons
    Try to generate custom document icons
--with-lua
    Build with lua support
--with-luajit
    Build with luajit support
--with-override-system-vim
    Override system vim
--with-python3
    Build with python3 support
--without-cscope
    Build without cscope support
--without-python
    Build without python support
--HEAD
    Install HEAD version
==> Caveats
.app bundles were installed.
Run `brew linkapps macvim` to symlink these to /Applications.