Apart from benefits like a better work-life balance, it helps to curb the carbon footprint as well by reducing energy consumptions at offices & savings on transportation.
In fact, many candidates are very particular about 5 days working, else they dont take a good offer also.
The subject comes up for discussion time and again. Twice I have given my views. You may refer the following links:
Dinesh V Divekar
However it depends upon the industry also you are in. Like in IT companies it is 5 days only but in most of the mfg segment it is 6 days.
More gets done and employees feel stress free. Of course, for certain activities, like front offices or customer support or some govt offices, where the need to keep doors open for as long as possible exists, the situation may be different.
Weekends having 2 days can be used to rest AND to unwind, relax, socialize and give time to yourself. On a lighter note, these 2 days also sometimes seem short, but one can manage.
I am assuming 2 day weekend becomes helpful to married women, mothers or even working couples to catch up with each other, with family, children and connect.
This is a one-sided comment and I haven't considered effects on productivity and so on. The comment is purely as an employee.