Todo systems are not just for important things. They're also for mundane things. A few examples from my own:
- Get the share of that £xxx bill from a housemate.
- Every Tuesday and Friday: Move trash kerbside.
- At least weekly: Process any unopened postal mail I have sitting around.
- At least monthly: Check my online bank and scan for any unexpected transactions.
Why on earth shouldn't things like these be stored and optionally teed up by a system?