Hi Dominik, hopefully you're still interested in replies... I can't help much with "organizing" but for print storage I use a flatfile (drawing cabinet). I haven't found anything better for storing prints, matting/mounting supplies, and other artwork materials. I have the "largest" size, cabinet is 39x54 inches. I can easily put 24x36 prints in a drawer side by side (or 48x36 prints if I was printing that big!), with room left over. There are smaller cabinet sizes too.
I built a wooden base for mine with big lockable casters from Lee Valley, rolls like a dream with no damage to nice floors. Store my paper rolls etc in the base. Added a simple smooth MDF panel on top for a work surface with some carpet underlay underneath it to prevent sliding. It's my do-anything workbench.
Something like this certainly makes it a lot easier to organize prints/materials, no matter how you do it. I recently moved into a smaller place and intended to get rid of it because it's big, but I didn't find any better way to store as much stuff as it does, as efficiently as it does, and replace the nice big workspace at the same time, so I kept it anyway. There's a reason so many companies had these!
Some tips for anyone looking for one... They show up used occasionally (check Kijiji in Canada) for wayyy cheaper than new ones cost, as companies clear these old drawing cabinets out of their buildings. I'd never buy a new one. Since I've tried to sell mine a few times, I can tell you they are challenging to sell. Although there usually aren't many of these cabinets floating around, it's also hard to find a good buyer. Many will tire kick at them, they want them, but don't want to pay anything for them (especially photographers lol

). And also some people have no way to move it themselves (mine weighs almost 400 lbs assembled, 2 trips in my SUV when moving it myself in pieces). So even an excellent one is slow to sell around $300 CAD, so now you have some "inside info" when negotiating with a seller. Office surplus shops will of course ask more, usually $500 and up. (Actually I suspect some of my low-ball offers are really from office surplus dealers wanting to flip them.)
Cheers