This is a really interesting perspective. I feel the complete opposite - extra stuff makes me feel suffocated and stressed out. The stuff feels heavy and demanding to me; demanding of time, mental and physical energy, physical and visual space so that the room feels like it's closing in on me, etc... When I'm faced with extra stuff I feel as if I'm carrying it physically and emotionally. And the burden feels too heavy and draining.
I'm an ENFP which is the most introverted of the extroverts and I do have a need for alone time and usually what makes me happy is gardening or being with my pets, listing to a relaxing tape, etc. I find those experiences refreshing and soothing in the way that you describe being with your things.