As someone that only has sporadic pockets of deep time in my free time the thing that has been immensely helpful from an LLM coding point of view is mental model building. I can now much more easily get "into the flow" after being away from a codebase for a period of time by asking questions. For example, remind me where all the integration points for that API route is located. Or give me a rundown on this file. Etc.. It gets me back up to speed so much more quickly and makes me productive with limited amounts of time. It also means I don't have to try to carry this context around with me or I'll forget it.