I did sort of the opposite of OP, during my masters I stopped just about halfway in because I just couldn't justify the time investment needed to complete the program over gaining experience at the startup I was already heavily involved in.
I completed all the "fun" courses, the ones that really taught computer science, but the focus and attention I needed to complete courses like advanced logic and discrete mathematics III I just couldn't combine with a fulltime job. I'm no math wiz, so those courses were really tough for me.
I now realize there's other universities that have less maths and more of the fun stuff, but even still say I wanted to jump to another specialization if I had 2 full time years to do it I could spend my time so much more efficiently than at a university.
What I remember most in general from my undergrad courses is that most the "fun" ones are the ones where I already was interested in the topic to the degree I knew something about it or if I didn't it's obvious I would have learned something if it was brought up at some time.
The "not fun" ones on the other hand are the ones I remember the most from because those memories aren't competing with lots of other exposure to those concepts and thus they left a lasting impression that I might not have gotten any other way.
Going down the path of "fun" might be easiest and overall more enjoyable, but it also ultimately might be less fulfilling in the end. Your mileage may vary, of course.
I completed all the "fun" courses, the ones that really taught computer science, but the focus and attention I needed to complete courses like advanced logic and discrete mathematics III I just couldn't combine with a fulltime job. I'm no math wiz, so those courses were really tough for me.
I now realize there's other universities that have less maths and more of the fun stuff, but even still say I wanted to jump to another specialization if I had 2 full time years to do it I could spend my time so much more efficiently than at a university.