DH always knew he didn't want a long commute -- his dad commuted 4 hours round trip. When we bought our house, we chose to be within half a mile of his employer. For 30+ years now he's ridden his bike to work. He leaves 5 minutes before he wants to arrive, it takes 5 minutes to get home.
So there are major time savings. For our family, that has been incredible. Our children saw him at breakfast, lunch (homeschool), and dinner. Even in family where the children go to school, there would be more time with a parent who lives close to where they work. Living close to work meant he could coach our children's various sports teams. He has time for his own hobbies. He has time to help his elderly mother. He can duck out for an appointment without having to take a personal day.
But while time savings is the most important thing, there are also financial benefits. We don't need him to have a car to drive to work, and currently share 2 cars between 3 adult drivers. The cars we do have are driven less, which means they last longer and need maintenance less often. He comes home for lunch, which is less expensive than taking lunch and far less expensive than getting lunch out.
The physical and mental health benefits can't be denied, either. He isn't seated in a car for a couple of hours a day, causing back strain, etc. He has time to exercise, which improves physical health. Commuting is also stressful, not having time for pleasurable activities is stressful, not being home to share meals with your family is stressful. There may be relationship stress if a non-commuting partner has to take on more house work or child care because the commuting partner has less time.
Before we had children I commuted 1 hour each way for 3+ years (no traffic) and hated it. I put 25K miles per year on my car just commuting. I was gone from 7:30 am to 7:30 pm. We hired house cleaners because I was so tired. We ate a lot of restaurant and convenience foods. One reason I became a SAHM was because the math just didn't support me having that kind of commute. I could stop working, cook real food, care for my own children (no child-care costs), clean my own house, etc. And because DH didn't have a commute, I could do those things and not feel like a single parent.