I have gone to canvas tool bags. I have one for each thing: electrical, plumbing, carpentry, etc. Each has all the little chit you may need, and a lot is duplicated between bags (like 3-ways for cords, small crescents, carp pencils, screwdrivers, speed squares, etc), but I know if I grab that bag, I have all the little crap you forget to do that part of the job. I do not keep tools in the truck, obviously, since I am not a contractor, other than a full set of mechanic tools to work on the truck. The hand tools are all in hard cases (which also contain the stuff needed for them), so it is a matter of grabbing what I need.
On the other hand, the actual tools of my trade ARE scattered into every available compartment: Line blocks, pins, and twigs in the compartment behind the passenger seat, notepads, cards, and hats behind the driver side. The glovebox has my tape and a rule, handcleaner, flashlight and pens. Blue shop towels and stucco tape in the center behind the console, and straps in the bungholes of the bedliner.