Do you keep a pot of water boiling all day long to make one pot of coffee or pasta? For comfort reasons it can be nice to keep a shop from getting too cold when you aren't using it. I can say, that it is more efficient not to do that though.
There are lots of studies that show letting your house, shop, etc cool down (or heat up in the summer) when you aren't using them is much more efficient. It's why programmable thermostats save energy over one that you "set and forget".
You are reinforcing exactly what I'm saying. Setting back a thermostat by a few degrees in each ~10 hour overnight period, in a well insulated dwelling (which is full of stuff which retains heat) is indeed a way to save a few bucks.
I think that this discussion has a lot to do with the characteristics of the space which is being heated.
If the space is essentially empty, AND is not well insulated, there is nothing other than air in that space, to retain heat energy that has been applied.
If, on the other hand, the space is filled with cars, equipment, etc, AND is well Insulated, then there is essentially a very significant heat storage buffer effect in play.