[pville]

Alt-x does the very same in Emacs. Every available command with tab completion and with the keyboard shortcut listed. I think showing the shortcut is new.

If you are not familiar what a particular command does you can use C-h f <function-name> to open the help page.

I think Emacs is really easy to learn after you get a handle of the navigation keys. Which you might already be familiar with from shell.