What are some things you cannot help but over-engineer?
It could be your car, kitchen, editor, food supplements, chrome extensions,...anything really.
Cleaning my cats' litter boxes.
I turn the vacuum cleaner on and put the hose into the box so it sucks all the bad air out. It also sucks all of the dust out when I'm scooping and when I put in new litter. I also set the air purifier at home to max. I put on gloves and I put on a mask before cleaning. I also buy the best unscented litter money can buy at my local pet store. Over time I've found out which cat food leads to less stinky poos (on going process).
I'm open to some good suggestions.
Login screens in the apps I build. I love animating the response. If there's a success, fade out, fade in a welcome screen, maybe a fun spinner... It's the door to your app, so it feels like it's time well spent. It gives the feeling of sophistication if done tastefully and well.
Breakfast. Sometimes I go to bed early just so I can get to breakfast sooner.
Time management tools. Calendar, gantt chart, waterfall chart, etc.
Home improvement stuff. I overthink stuff, get into analysis paralysis, and then go back to basics before implementing something that's rather overkill for the application.