Years back after watching Saint Roy do a show on the French workbench I decided that I would build one of that design someday thinking it would be a challenge and trust me it was and I included a storage shelf 7" off the floor.
Didn't take long for the advantages to become apparent. First you have a place to throw any jig, support blocks, wedges, off cut and other junk after the tool tray over flows that you just know you will need someday till you can't find any of them. The real advantage is if drop anything you know where to look for it. Case in point, dropped a 1/4" nut standing four ft away and it made a beeline to get under that damn shelf. 18'X24' of shop and at least 3' clearance for the bench, but no....under the most immoveable object in the shop.
Gotta love it and don't even mention organization, I've concluded that for folks who are just to lazy to hunt it.
Y'all have a good day