Anything, really. Structuring work and breaking it into smaller chunks, keeping track on tasks, getting back up to speed on past tasks. Mundane stuff like planning out furniture purchases, having it walk me through the requirements etc. It just lowers the barrier to start, as starting is just a single sentence away and everything else flows from there.
They have helped me a lot with chunking tasks, and guiding me through tasks that I can't hold in focus.
There's a prompt I used while moving out, where I had claude ask me questions, what is in each room. And then once we had this item list, organizing it.