Before getting the Deck, I pretty much gave up on gaming because I started working fulltime remotely and I didn't want to just continue sitting on the same desk after work and continue gaming there. It's bad for my physical and mental health.
Since getting my OLED end of November, I've been playing an average of 3h per day despite fulltime work and spending holidays with family and friends… oops :D
I think it will definitely go down once the honeymoon phase is over, but its impact is already made. Through it I've found a new way to fit an old hobby back into my life.
I'm also using it to watch stuff on TV in docked mode. The portable format is just perfect for it.