Wiremold 4000 is a NEC 386 raceway, section 386.22 applies. Basically no section 310.15 (B) derating for 30 current carrying conductors or less. Even 2 compartment divided 4000 raceway meets the requirements of 386.22 for both compartments (each one is more that 4 sq in cross sectional...
When planning the shop, I considered many of the points that 72Anthony raised above.
Since the lighting was unlikely to move, I put the switches in the wall and wiring above the ceiling.
I ran underfloor conduits to major tool locations and assembly bench locations to avoid extension...
I did a wrap of 4000 wiremold all the way around the shop under the windows. Best money I ever spent!! Adding circuits, reconfiguring stuff, moving tools just requires popping off the appropriate covers and making the change.