Don't buy all the matching pillow shams, etc that make it a project.
Simply straighten the blankets and sheets, pulling the comforter or bedspread over the pillows.
Color coordinate your sheets, especially if they show.
Sheets
Wash them and put them right back on the bed, or:
Stuff them, unfolded, into one of the pillowcases.
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!