Most of my stuff was underutilized, i.e., Nest, Wemo, Harmony Hub. Since I got my Echos, I've accelerated my timeline to put more smart switches throughout the house.
My favorite routine with the dark winter mornings is to use a single voice command to turn on my main floor lights and tell me the temperature outside as I groggily take my dogs downstairs to go outside. The temperature announcement lets me know whether my dogs need their coats on. It was especially useful today, as it was -23C this morning.