I salute you men and women who

When I built my garage I intentionally built one workbench, about 40 by 24 inches, and one shelf, roughly the same dimensions and 8 ft high for miscellaneous parts and some power tools. I have 2 small shelves, about 14 by 24 inches, but they are mounted about 6 ft high, and only used for stocking oil, antifreeze, brake fluid, and air/oil filters.
I have learned through experience that any flat surface has exceptional magnetic properties that will only attract more junk. I also repurposed an old medicine cabinet for things like brake cleaner and other spray cans. Of course I also have at least 2 old milk crates in the basement full of other spray cans and paints that can't be left outside in winter, since I don't have heat in my garage.