Russ from MN said it well in my mind. Just remember trapped air insulates well, so as you put blue foam up make sure it adheres to the wall well and does not leave an air gap where air can flow.
A block wall is not even a good wind break insulation/thermo wise it is so porous. Be opportunistic like Russ said, cover what is easy first. e.g. maximize sq. ft. per hour of your time. However, in the long run cover it all.
There are two things that make your shop feel comfortable, radiant and convective heat. Convective is what you feel from the heated air from your furnace. Radiant is what radiates from your block walls. In the winter those block walls make you feel cold even though the air is warm. Once you get that block covered, you sure will notice a difference and feel warmer at cooler air temperatures, more savings.
If you do consider a spray foam at all keep in mind there are open cell foams, e.g. the bead board, and closed cell foams, e.g. the blue DuPont Foam. The closed cell foams also act as a moisture barrier. Yes, I know I am mixing my examples here, spray foam vs foam board. I just don't know what examples are in the spray foam world. My 30ftx72ftx11ft shed was completely sprayed with a closed foam, 2". It is so tight. I put 6 mil poly under the concrete. The shed is so tight I can easily keep it at 50% humidity with a single dehumidifier here in the Wisconsin humidity. I lined my shed with white tin.
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