It clicked for me in a neighbor's garage, of all places, on a Saturday when I was looking for a ladder and ended up just standing there staring. Every tool had a spot, the bikes were off the floor, and the whole thing looked less like a garage and more like a room he was proud of. Mine at the time had a wall of cardboard boxes and a lawnmower I could barely get past. I went home and started measuring that same afternoon.
What nobody tells you is how differently these age depending on what they're made of. The cheap particleboard ones look fine for about eight months, then the humidity gets in, the bottoms swell, and the doors stop closing right, especially if your garage isn't heated or cooled, which most aren't. A good cabinet in powder coated steel or real plywood shrugs that off for years, through heat waves and cold snaps and the occasional roof leak nobody noticed until it was too late. Wipe them down twice a year, keep an eye on the hinges, and tighten anything that starts to wiggle before it gets worse, that's basically the whole maintenance routine. When you're shopping, check the weight capacity of the shelves and actually believe it, because a shelf rated for thirty pounds will absolutely let you know when you've put sixty pounds of paint cans on it. Check how the doors hang too, open and close them a few times right there if you can, a cheap door swings crooked almost immediately and never gets better.
The difference between a well made cabinet and a disappointing one usually comes down to three things: the material, the joints, and the finish on the metal or wood. Good ones use continuous welded seams or properly doweled joints, not staples and glue holding a shelf together. The finish should feel slick and even, not tacky or thin enough to chip the first time you bump it with a bike pedal. Drawer slides matter more than people expect, a full extension slide with some weight behind it feels completely different from the flimsy kind that jams if you load it even slightly off center. I learned this the hard way with a set that looked great in photos and fell apart in real use within a year, doors drooping, one shelf bowed so badly it looked like it was smiling at me.
The one mistake to avoid is buying based on looks alone and skipping the weight ratings and the hardware, because a garage cabinet that can't hold what a garage actually holds isn't furniture, it's just a box waiting to disappoint you.