We have a four bedroom house, and keep two of the rooms for visiting family, though that's probably only 2 or 3 times a year now. The tiny fourth bedroom is my craft room. It's packed floor to ceiling with crafting materials and equipment plus a large monitor computer and printer. I haven't worked in there for over three years because there's just no workspace now, and I no longer do a lot of the crafts that I used to, so it has become a (rather dusty) store room. I now do all my sewing (my main interest) in the diner where DH built me a sewing cabinet for my machines and we have a giant dining table which doubles as my cutting table.
I've been considering turning my craft room back into a bedroom for the smaller grandchildren when they visit, but goodness knows what I'd do with all the contents! I can't even put it in the loft because there's even more up there! I'm not a hoarder but every time I throw something out I then find I need it. And DH often asks "Have you got......" and I'll say "Oh yes, it's upstairs in 'my' room".
I'd love to have a shepherd's hut or my own shed but DH won't relinquish any more of the garden.