Just one example: if you study CS from the cognitive side, you start to wonder WHY you can't do certain things. Instead of problems being inherent in your system or your software, and then you don't go any further, it could be that they're just plain impossible, or hard enough to define that you just can't do them.

Or for another example, what are concepts? In purely formal languages they tend to be defined within the system, but those are nearly empty concepts. You should be trying to break out of whatever system you're in.

I think any good textbook on cog sci could give you more ideas than I can. It doesn't even matter if it's 20 years old, the issues are enduring issues about minds and cognition, human or artificial.

Answer your own question. Prove, at least to yourself, that I "don't know what I'm talking about." Then you're likely to be a successful cog sci major, a researcher, corporate or academic, or a professor. Or maybe you can just do coding, but do it better with your extra knowledge.