I am typically in the one man tent camp. If I am in the tent I am either reading, writing in my journal or sleeping. None of those take much space. I find that I really don't need a lot of sprawl space.

That said I never bring much gear in. Everything except what I need to sleep, my clothes for the morning, and my handlebar bag (which contains any electronics or valuables) stays in the panniers and on the bike.

Only you can say it that will work for you or if you need more space.