Small rooms and dwellings set the mind on the right path; large ones cause it to go astray. Leonardo Da Vinci
Since downsizing from a 4 bed detached to a 3 bed end terrace we no longer have any wasted space. We have lost a spare bedroom/study, a utility room, a music room/garage conversion, a separate dining room in addition to a kitchen/diner and two sheds. We have lost years-worth and room-sized-amounts of clutter. Do I miss the space? NO. Am I glad we downsized and pared down our belongings. YES.
Our new house is big enough for two teenagers to have their own space, for up to 8 to eat at our table in the kitchen/diner and for two adults to work from home. Every room is used everyday for a variety of tasks. Washing and rubbish are more noticeable in our kitchen and we have to keep on top of laundry and rubbish/recycling. We have to be more organised and ruthless with what comes into the house but that has become a normal way of living.
We still have too much but we are getting nearer to having enough. And having just enough space is a very comfortable sensation. Being happy with what I've got is a much richer feeling than the constant nag of wanting more.
I would highly recommend downsizing to anyone who is considering it.