I use it to manage my task list. I have Codex hooked up to Obsidian and it manages the tedious stuff that would be onerous to do by hand. Organization is by far my greatest weakness. I would be so much worse at my job if I had to spend my mental energy doing menial shit.
The smaller and more procedural the task, the better AI is at it.
What personal notes? That Sathyaraj has managed to turn about 3 weeks of work into three months? That I have to remember to hound the platform team to review a change request? Or that I requested a production change so I have to remember to go to the approval board today to get it approved?
OpenAI can have all that.