Well, one example is that patterns in code now can make you recall bugs you've seen in the past. I had this realization where I used an LLM to do a big refactor, and it fixed a bug along the way that I should have realized was much more urgent than the refactor, having seen an identical bug in the past (it was related to prefix-checking in a set that wasn't constructed to do that kind of prefix-checking). Had I done the refactor by hand I'd likely have realized it much quicker.