OCD - Old school style
My grandfather, Bernie, was possibly the most organized man that ever existed. Or at least one of the most organized. Everything he bought was labeled with the date and place it was purchased. And most of his purchases lasted a long time due to the extreme care that he took with everything. Considering his many collections his house could have taken on a pack rat appearance but absolutely everything had a place and everything was always in its place.
The example that jumps out at me to describe his organizational skills the most are his lightbulbs. He had taken a piece of wood and drilled holes that allowed him to set new lightbulbs into those holes and each row was labeled with the type of bulb. The messiness of a various boxes of bulbs would never do, this method was much better.