If you like speed as much as I do :

1. Total Space. Setup shortcuts and disable transitions

2. Disable (or speed up) OSX animation (I don't have the commands on my phone, just Google it)

3. iTerm and window splitting (Cmd d) and switch (Cmd [ or ])

4. And The REAL time saver : Keyboard Maestro Create at least one macro per app. I assigned shortcuts like

Cmd Shift L - iTerm

Cmd Shift / - Atom

Cmd Shift ' - Chrome

Ctrl Shift < - Finder

Ctrl Shift M - Mailbox

And so (Xcode, Slack etc.)

Then I pur each app in fullscreen (Ctrl Cmd F).

Now I have O(1) access over my computer \o/

Edit: disclaimer I'm a vim user