I've been using the terminal since forever, it has become second nature to me now. The only time I ever load up graphical applications is to load games or browse the web. And honestly it feels slow as hell, not because the UI or system is physically slow but because so many UIs feel like they get in the way.
Kind of like how Cypher in the matrix says he doesn't even see the code anymore, it's just second nature. It can be hard at first but I rarely make mistakes these days, and when I do, they're usually syntax errors.
If you spend enough time using the CLI you'll become familiar with it to the point it becomes second nature to you. When I first started using Linux it was intimidating but then again when I started using computers (MSDOS) there wasn't anything else yet I was able to learn. So I forced myself to learn and I'm glad I did.
I wouldn't use any GUI ever if it wasn't for web content and games.