I'd be lying if I said I didn't like "stuff." But, I don't have any clutter or junk. I am not a saver and I've moved a fair amount of times, so I've always thrown out things that aren't used. Do 2 people need a 3,000 sq. foot house? No. But, I love my house, which took 5 years to remodel/make my own and I don't plan to move soon. My stuff is furniture, nice housewares, a lot of which are from my mom, my clothes, and my bikes. I don't have fancy, expensive art work, but some prints that I really like. DH is a gadget freak. He has a lot of tools and electronics, but the upside is that he does most of the fixing himself, because he enjoys it.
We don't have a traditional basement in this house; in fact, my last house was the only house I've had with a basement. We accumulated a lot of stuff in the basement over 9 years and it was a very big clean out job before moving last time. Our lower level here is my family room and guest room, but I have 3 big storage closets. None of them are really filled too much, but we have a storage space above the garage that has all of our kids' old toys, etc. I refuse to throw out some of this. DH still has not forgiven his parents for throwing away some of his childhood things without telling him! Even if I never have grandchildren, I will give them this stuff when I leave this house. I don't want to be blamed for giving away their things.
I like clean, modern lines, and I dislike "collectibles," or other tchochkes. It took me 20 years to buy any new furniture that was not Danish modern, and even that stuff is pretty minimalist. Every time I've gone house hunting, I am amazed at the amount of junk people have in their homes.