Does learn Linux shell/command line useful for DESKTOP USER? Can you give me some examples?

I have read several books about command line and scripting for Linux (bash). I think, most of them is useful for Linux Administrator (Server cl). But, for Desktop user (who just use computer for office task, such as email, internet, presentation, make letter, and so on), I don't think it is necessary to learn it. Using GUI is enough. How do you think? Thank you.