Its kind of funny. In our initial training the FAA requires that instructors really drill it into our heads when we using magnetic vs true numbers then as soon as you pass your first check ride you basically never think about it again.

I've been flying since 2013 with almost 500 hours at this point. I could make some educated guesses about where we use true vs magnetic, but aside from runway designations couldn't tell you much for certain.

Its never come up in my flying.