>I made a CLI logs viewers and querier for my job, which is very useful but would have taken me a few days to write (~3k LoC)

I recall The Mythical Man-Month stating a rough calculation that the average software developer writes about 10 net lines of new, production-ready code per day. For a tool like this going up an order of magnitude to about 100 lines of pretty good internal tooling seems reasonable.

OP sounds a few cuts above the 'average' software developer in terms of skill level. But here we also need to point out a CLI log viewer and querier is not the kind of thing you actually needed to be a top tier developer to crank out even in the pre-LLM era, unless you were going for lnav [1] levels of polish.

[1]: https://lnav.org/