I really enjoy placing objects freely on a blank canvas. Many games let you do this, but many more do not. The feeling is great. Think about planting a seed in Starseed Pilgrim, placing that first object in Wilmot's Warehouse, or playing a stone in Go somewhere not near the opposing colour, just out in the open. A Center in the Void.
I like level design because I get to do this. The question arises: Do I make a game that allows players to do this, or do I make a game that allows its designer(s) (me?(and who else?)) to do this?