Good points above; I agree with many of the other posters. But there's one thing that hasn't been mentioned yet about the terminal:
It is easier for the person being helped to attempt a CLI solution, because if error messages arise, they can simply cut and paste to the forum.
If I give you instructions for installing something in Synaptic, but it doesn't work, you have to take a screenshot and figure out how to post it to the forums.
If I give you a terminal command, and it generates errors, cut & paste and the people here on the forums can help you, instead of guessing.
"I tried installing wine but I got some error" is an all too common type of post on the forums. "Here is the terminal output when I try to install wine" will get you a much more helpful response.
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