- Command line will give you the most bang for your buck every single time. Learn one small thing at a time and build upon it, you will be amazed at how much more productive and quick you will become from understanding simple commands.
- Start using Vim/Emacs. Doesn't really matter which one, the gains from using a powerful editor will (in the long run) pay for them selves.
These editors combined with the command line have shown the greatest gains in my productivity.
Now that said learning the editor will be up hill for a good chunk of the time until it clicks, so it may make sense to use something like geddit in the mean time.
There is no magic bullet with any sort of Development. Using unix like systems isn't going to make your website better or you more productive if you don't actually take some time and learn it. If you come over to Ubuntu but only use the GUI you will likely loose productivity.
Besides who cares what you write your site in as long as you -write- it.