As an active daily player, I really love this. It's something I suggested right when the game was released. I really like that I'll finally be able to get something in the game for all the walking I do at work and around the house. It's also crazy how many people online so far don't seem to understand how this will work. No, it won't use GPS in the background, no, it won't use any more data than having the app open, and no, it won't make the Go Plus useless (you can't spin PokéStops or catch Pokémon with the Health app integration!).
Welcome change, and the weekly stats will be awesome too!
I've never played Pokemon Go but just seeing how enthusiastic you are about it puts a smile on my face. You're always so cheerful. I love it.