Yup
Brother in Law's work basically went to 4 day weeks last year, not through choice and the staff still work the same hours but because they run plastic forming equipment and someone in management finally realised that having 4 shifts covering 7 days and having something like a third of the machines sat idle but hot (they take a long time to warm up and have to be cleaned properly before they get cold) was costing them a fortune.
So they consolidated the 4 shifts into 2 and now run the machines for 4 days with much less downtime.
Apparently when the cost of energy started to go down some management started muttering about going back to the old pattern (slightly more resilience if a machine goes down) and was basically told to get lost as they could get jobs that paid nearly as well but with far better working conditions on 5 days a week.
It turns out the guys working there like having the extra day to take things easy so they go into the weekend actually able to enjoy it rather than exhausted, especially as they change shift every two weeks or so (swapping through 12 hours).