I personally don't use sticky notes, at least they really make me feel uncomfortable, because they take a particular place of my monitor. I use reminders in my phone and actually they don't work worse than sticky notes. Sticky notes are the very old invention and nowadays all the smartphones have reminders inside. I use them and they help me a lot. I just either set a particular time for a certain task and when I get a reminder I stop doing it, or set reminders on a certain day in order not to forget about various significant things. For example, I have a reminder on tomorrow, to go to the supermarket and buy some things.