I've noticed that when we hire newly graduated engineers, we saturate them with CAD (or its equivalent in programming), bureaucracy, and troubleshooting. They forget the cool stuff that they learned in college, such as math and theory, and burn out.
If you want to keep up with that stuff, you have to figure out how to weave it into your regular work, so you have an excuse to continue learning more about it, or give yourself some free time to learn cool things that you might use later, or might not.
A lot of people tend to measure themselves by how busy they are. I believe that's a death trap.