It's not a cheap option, but I also LOVE my Rachio sprinkler controller. Obviously that's only a fit if you have a sprinkler system, but having one that works on WiFi is a game changer. If you're out in the yard testing things out or blowing out your system, you can just turn on or off the zone you're working on using the app.
It also has modes where you can just tell it the features of each zone and tell it to take care of it from there. It'll dynamically adjust the days it waters and the timing based on the weather. Saves you water and is super simple.
https://www.rachio.com/
It's kind of like a Nest thermostat for your lawn. I have one of those too, but I wouldn't call the Nest a no-brainer purchase compared to some of the other stuff I've listed. It's good for sure, but not absolutely fantastic.