Theory of electromagnetic field (of which Maxwell's is a part) was one of my favorite topics in the university. The other being digital signal processing. I don't have very good memory, so I have to rely on things having a lot of consistency and internal structure so they could be efficiently "compressed" and "recovered". Both of these fields have that - the math is consistent, beautiful, and somewhat more intuitive than in other fields. Theory of electromagnetic field does assume that your integral and differential calculus is pretty good though.