Do you have kids and/or a wife?
Both seem to love to turn on every light in the house and then "forget" to turn them off. Or worse, they will leave outside lights, or lights in the garage or lights in the basement on all day long and waste electricity.
I have been using WIFI plugs and receptacles, WIFI switches and WIFI light bulbs for years now and they have been a godsend in lowering our electric bill. We have indoor and outdoor lights put up during holidays, little village displays with lights in them on hutches and mantels, shed lights, front door lights and a bunch of other lights around the house that I use the WIFI plugs, receptacles, switches and bulbs for. This gives me the ability to not only turn them On and Off manually (via the switch for example) but to also set timers for them to turn On and Off automatically when we want them on and off.
That, and I can look at the app for these things when I am away from home and see if anything was left on during the day by someone in the house. If they were left on, instead of wasting the electricity with them being on all day I can use the app to shut those things off remotely from wherever I am.
These things work great, save electricity and most of all save the constant arguments with family members forgetting to shut things off. Sometimes there is no amount of yelling and screaming at your wife and kids that will get them to learn to shut off the lights when they leave a room or whatever, so you do what you can to do it yourself. If I am home I will go around and shut things off that others have left on, but it is really nice to have the ability to also do that when you're not home and able to do it in person.
Jim