Comment by Groxx
Whiteboards have been my main strategy too. And a little while ago I ran across this: https://community.frame.work/t/whiteboard-input-module/58985 and bought the same stickers and pens and it works much better than I expected - the pens write super-durably for dry-erase and light bumping doesn't erase them at all. I have weeks-old reminders on there that are almost new looking.
For day to day stuff I just use a more normal whiteboard that I do my best to erase at the end of the day, and migrate longer term stuff to some other location. I like it better than a regimented "always empty" system since reasonable leakage from one day to the next is pretty common for me.
The good thing about todos on physical objects like a whiteboard is that the space is limited. Todo software tends to accumulate tasks until there are so many you’re overwhelmed with anxiety just opening the app, and pruning them would be yet another tasks on top of the mountain.