I knew a woman who would gauge her level of depression by the pile of dishes in her sink.
I am not good at remembering where I put things - I never know if they got filed by function, shape, or association. So, I do better with a corner of everything I've used recently still showing. A super-tidy space looks sterile and uninviting to me. In school, we always had to tidy up just when it was getting interesting. Now, I'm learning to clean up after each phase of work, rather than pile on a new layer. If there is at least one clear table space, it is far easier to start a new job.
I maintain a workshop and hoard scraps of material for it, but I'm not an acquisitive collector. I can often make what I want from stock on hand, but if there is no new material coming in, I feel too limited. About nine years ago, my main workroom only had a narrow path through it so I could get from the bedroom/study to the kitchen/bath area. I decided to resume silversmithing just for my own enjoyment, since it had been my favourite way to not make a living. One thing led to another, and now the shop is fairly tidy despite the room taken by sheet-metal works and custom lumber milling as I put the finishing touches on a whole new roof for the house. It is not a very creative-looking job, but there was a steep learning curve on this funky old house, and also considerable danger to avoid. I worked almost flat out for two months, and then had to clean house for Halloween. The vacuum cleaner clogged several times, but I got done with more minutes to spare than in years past.