I used tasker to display an icon on my status bar to tell me whether auto rotate is enabled or not. I kept lying down on my side forgetting that I had auto rotate on and my display would rotate when I didn’t want it to.

It’s an incredibly specific and minor thing that was annoying me, but tasker let me fix it. It’s a great tool, but can be complicated if you aren’t familiar with scripting. Luckily it’s got some presets and a “basic” mode.