I may not be writing compilers professionally, but on the surface, understanding parsing has gotten me out of more than a few tight corners. More abstractly, there are lessens to be learned in designing large applications; and appreciating the difference between a finite state machine and a deterministic turing machine, including the types of problems they can solve and how much of a pain in the ass one is to write compared to the other.
CS still comes in handy though, especially computer engineering to understand some of the workings of the hardware
Occasionally I'll use real CS knowledge when I'm building tools for work or working on games in my free time.
Full disclosure, I didn't actually study CS in school though.. I studied EE and then went and learned CS via Wikipedia when I needed it to find a better-paying coding job.
There are interesting compiler roles but the vast majority who learn how to build a compiler never use it day to day work. Would you recommend spending more time building compilers to better compete for those few roles or would you recommend a different approach?