Spent the whole weekend building a tool wall and my shop finally feels organized

Built something similar last winter out of a sheet of baltic birch I had left over from a bookshelf project. Mine was mostly French cleats because I keep rearranging things, and being able to move a holder without unscrewing anything has saved me more arguments with myself than I can count. The nailer hangers and a shelf for the random orbit sanders came off the wall twice already and just went back up wherever I decided I actually wanted them. Your grit sorting idea is better than what I did though. I just screwed a couple of plastic bins to the wall and they became a jumbled mess within a month. Dividers make way more sense because half the time I grab a 150 when I wanted a 120 and don't notice until the wood's already scored up.

The measuring mistake got me too, except mine was the charger. Built a nice slot for the impact driver and then realized the battery wouldn't clear the shelf above it, so everything sat at an angle for a year before I got around to fixing it. One thing that made a difference for me was leaving a couple of empty spots on purpose. Every time I buy a new tool I've got somewhere to put it instead of the kitchen junk drawer, which is where my old jigsaw lived for two years.

I went with a rolling cart instead of a wall for most of mine, and honestly it changed how I work. My garage is a single car setup, so the wall behind my bench is only about six feet wide and I kept running out of room. Picked up a steel utility cart off a liquidation site a couple years back and now the track saw, the two Makita drills, and the jigsaw all live on the middle shelves in thier cases. I wheel the whole thing to wherever I'm cutting instead of carrying tools back and forth. The wall still gets the small stuff, but I hung pegboard rather than building dividers. I know pegboard has a rep for looking like a hardware store, but being able to move a hook a half inch when a clamp doesn't fit right has been worth it. I traced the outline of each tool with a marker right on the board, so it's obvious when somthing's missing and where it goes back.

One thing I did learn the hard way in a similar vein to your battery lesson: leave an inch or two of clearance under anything you hang, because I hung a brad nailer once where the nozzle hung down past the hook and it took a beating every time I pulled it off.

The tracing thing changed my setup too. I grabbed a sharpie and drew around every tool on the board, so now I can tell what's missing from across the garage instead of hunting for the sander that's buried under a drop cloth somewhere. Cheap and ugly but it works. I'd add that you shold hang the heavy stuff at chest height if you can, my first attempt put the planer up high and I regretted that every single time I lifted it down. Also the burned labels are nicer than mine, I just wrote on masking tape and half of them have peeled off allready.

Update: tried the tracing trick with a marker around each tool and it works better than I expected. Spotted the missing jigsaw from across the garage before I even started hunting. Still losing the war on small parts though, the bins fill up with mixed junk fast. For the cleats poster, roughly how much scrap board does a full wall conversion eat up?