I have normal lights, but the switches are on a Lutron hub. I like being able to set movie mode to dim lights from my couch on my watch or phone. I like being able to turn off my kids' bathroom light when it shines too brightly in my face at night when I'm trying to sleep. I like being able to turn the lights off across the whole house when I leave, and have smart away when I leave for awhile.
Smart thermostats are nice when you want to adjust things from all over the house or keep a schedule relatively easily. I also like knowing if my basement sump pump isn't keeping up with rain water and flooding things.
In general, it's nice to be able to monitor things and control them across the house, and the Lutron setup has been pretty painless.