I've felt good about every learning that I got out of my comfort zone because I know what to do for next time, but that's usually not the case. In the real world you're not going to be facing the same problems over and over again. My problem solving skills have deffinetly improved because i've realized that always learning something new isn't always a good thing because there is always something new you can be learning. I've learned that applying and doing will help you solve more problems rather than taking too much time learning about details that are irrelevant.
When working in the business world I've noticed so many average people saying "you learn something new everyday." They say this to hide the fact that they feel insecure for not knowing that new thing. You do learn new stuff every day but learning shouldn't be your focus, it's being more effective in your job that's going to do the trick. In my opinion, I think you should be happy for the knowledge you already have and apply it because you can be surprised what you can do with the knowledge you already have.
