What's that saying we hear time and time again on here? "I'd rather have it and not need it, than to need it and not have it." 
Impressive.I have 2 good size roll around tool cabinets (2 part types) for my tools and all the auto body tools I inherited from my dad (lots of air driven tools as well as all the different body shaping tools). They're pretty much in one place and don't get moved around. The one with my hand tools in it I labeled the drawers so I don't have to remember which drawer has what in it.
Speaking of tool cabinets for firearms: This is my 9 drawer Craftsman for most of my DA Rugers. These pictures were taken about 18 months ago, I have since added 5 or 6 more DA guns that filled holes in my collection. My SA and semi-auto Rugers are in 2 standard 22x15x60 safes that I modified to have shelves.
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So what do I do as a long time veteran dealer tech that just finished 2024 ranked 6th in the zone overall. Do more with less? Silly ...To answer the original question. I think big tool boxes are a waste. I have been able to do everything with my one Homak triple box.
Some people have tools, other people borrow what they can and make do.
An 'unwritten' rule where I worked was that if you needed a tool and didn't have one and someone else did it was OK to 'borrow' it but, you also then bought one because 'one borrow' is all anyone ever got.
I found a plastic aerobics step in the trash. I put it infront of one of my tool boxes so I can see the top shelf.At 5' 10", I'm too short for that older style.