If you have to get in a car and drive to a parking lot somewhere to get groceries, commute to work, go out with friends, get healthcare, etc. You will obviously live a less healthy life both physically but also mentally because of it. Walking is exercise, it's something we were all evolved to do and it keeps us healthy physically and mentally. It also encourages community when everyone isn't surrounded by a metal and plastic multi-ton machine. I recently moved to a walkable part of my city and it's actually amazing how much it's benefited my life. I say hi to neighbors and people who walk routes like I do, I get fresh air since not every street is filled to the brim with cars, but honestly one of the best effects is silence. Cars our LOUD. Even electric cars unfortunately, it really has little to do with the sound of the engine at speeds like 30mph, it's more about wind and tire noise. Meanwhile, people walking, biking, or on scooters are silent and it's brought me a lot of peace.