Inspiration is cheap. Action is expensive. The gap between them is 'Planning'.
Think of the Pin as the Inspiration. Think of the Note as the Plan.
Pin: Picture of a deck. Note: 'Lumber list: 40 2x4s, 10 4x4 posts. Weekend project for June.'
By forcing yourself to write a note, you move the item from 'Fantasy' to 'To-Do List'.