Is it worth it to learn Java GUI programming?

I'm a computer science student (2nd year), and in my university, they focus too much on Java programming.

So, I started to like Java because I found it easier than C/C++ and I wanted to learn GUI Swing Java Programming on my own (because they didn't teach us how).

I developed a Calculator program, TicTacToe game, Converter program, Encryption/Cipher program. And I wanted to learn more and make more of these programs. However, people are not really impressed when they see that I made such programs because they're in "Java."

And here, they say that Java Swing is slow and useless to learn. http://ift.tt/16DuBLw

So my question: is it worth learning?

As a computer scientist, how my future job would be like?