Comment by lone-commenter

To "disable" the Dock — not really: it will pop up sometimes, e.g. when some icon bounces, but anyway — you can

    defaults write com.apple.Dock autohide -bool true
    defaults write com.apple.Dock autohide-delay -float 100
    killall Dock

Here 100 is how many seconds you will have to keep the cursor on the edge of the screen before the Dock appears. You could set it to 3 or 5 should you need the Dock sometimes but don't want to trigger it by accident.

[Edit: Autohide can be toggled on/off also with ⌥+⌘+D. You can use the combination to show/hide the Dock, paired with a high autohide delay.]