I enjoy CompSci as a distraction - my background is pure maths/mathematical physics so don't think I don't appreciate abstract nonsense - but using it daily is impossible without a lot of contortions.

Contortions I can do easily mind you, but other than recursive functions and linked lists any more complex data structures are too fragile to survive the harsh world of constantly changing business requirements.

As a younger developer I wrote a beautiful algebra that described the company hierarchy for giving permission levels to people from active directory. Within a week I needed to scrap that and redo it from scratch because people needed permissions in the specific app that had nothing to do with their job position.