I've watched roughly 90% of the series to date and I'm happy to report that this "jumping around in a bunch of files trying to figure out what memory write caused an issue at run-time" is infrequent, at best. Occasionally there's a gnarly wild-ponter-esque bug that takes an hour, and very occasionally two, to debug, but the vast majority of the time on the series is spent writing new code and refactoring old systems that need to use some new feature.

I actually find it amazing that sometimes 400 hours of programming and 2 years later he goes back to code written in the first few weeks and is fairly easily able to modify it to work with a new system that's just been implemented.

EDIT: Formatting