I've lived in my current apartment for 8 years. That's the longest I've lived somewhere, aside from the house I grew up in.
I sort of did the KonMari thing over the winter. Got rid of a lot. Went through again this weekend and pitched papers and a bunch of small stuff. I now have very few physical books. Most are on my Kindle. If I had to, I could move on very short notice. The only thing I'd really have to deal with would be food items.
I'm even pretty minimal with my shooting hobby. I only have a few. I recently acquired a rifle, but the stuff for that is limited. The only thing I really "hoard" is ammo, which I buy mostly online in bulk as it's so much cheaper. I have dedicated plastic containers for it, and everything is in its place. I don't hesitate to sell guns I don't shoot anymore/don't need to fund other purchases.