How I learned to love the terminal
Knowing your way around the commnand line has many benefits. With a bit of practice, you can accomplish many tasks much faster on the command line than using any other tool.
The command line is almost always available, unlike some GUI tools that must be installed. You can save frequently-used commands as aliases and save time. Your bash history will save your bacon at least once when you forget how to do something. When you ssh into a remote machine, such as your work station or a virtual machine in the cloud, you can use the command line instead of a slow GUI.
Source: How I learned to love the terminal, an article by Franziska Hinkelmann.