I put a wall down the middle of my garage as well.
The longsuffering Mrs. Galat requested, "no more metal shavings" on her side or in the house. It works well to segregate the unwashed masses from more genteel folk.
I went from 3 stalls and 32 x 40 (x 14 ft high, then an 8 ft "hay mound" loft) barn at the "big house" to a space that defies description, but which is much smaller and at the same time more posh at the new "in town" place. Space saving went so far as to hang an 80 gal 2 stage Quincy compressor from the ceiling above the blast cabinet. I can fit 4 vehicles in "my side" if I make use of both lifts. It's tight.
I can tell you this with absolute certainty-- it is far, far easier and less expensive to just build a big building that to try to make a small space work like a big one.