Fitness trackers- what do you get from them

I have a Vivofit, (replaced my Fenix, which was too big and bulky on my tiny wrist and I was afraid I'd break it).
The thing that's surprised me most is how much I like to have the sleep data. I can say "I didn't sleep well." And look back and see when I was awake and figure out why. (I'm having some dental pain- surgery scheduled on the 11th, but you can see where i wake up in pain, toss and turn, finally get up, take more painkillers, and the drift back to sleep).
I do get a little annoyed because it's wrist based, so it doesn't count me as active when I'm doing things like making dinner, washing dishes, or folding laundry. I just spent an hour and half cooking, eating, and cleaning up brunch, and it says I've been inactive for over an hour and is blinking at me to get up and move.