Next time you use them, pop them into the dryer (with a dryer sheet) for a few minutes. Wrinkles are gone, they smell nice, and the best part is that you didn't have to fold them!
Sheets
Wash them and put them right back on the bed, or:
Stuff them, unfolded, into one of the pillowcases.
Making the Bed
Simply straighten the blankets and sheets, pulling the comforter or bedspread over the pillows.
Don't buy all the matching pillow shams, etc that make it a project.
Color coordinate your sheets, especially if they show.