I used to take the time when I was very proud that my linen closet would pass a Martha Stewart inspection. I had to lay the sheet out on the bed to connect the corners just right.
But being that anal retentive drove my s.o. at the time away. I decided to let go and just be an easier person with whom to live. I now do a half-ass connect-the-corner fold and sort of wad everything else up inside, put it in the closet, and shut the door.
My DH and I don't care about wrinkled sheets beneath our tushes, and our guests can be happy that they have a clean guest-only space in which to sleep. If that means the sheet under their tushes is wrinkled, well so be it - they have high thread count sheets and should take what they can get!