Honestly, e-bikes have been the technology that has improved my life the most in the last five years. I live in a hilly place, and with my first e-bike a few years ago, I suddenly became able to commute by bike. Then, with the cargo bike last year, I suddenly became able to take my eight-year-old places by bike.
She sometimes actually hugs me while we're out on the bike. Best damn thing in the world, and it couldn't happen in a car.