The galley layout (two walls opposite each other) is one of the most efficient you can get for a single cook. With two points of the triangle on one wall and the other point on the opposite wall, your walking distance will be short, but there's also room for plenty of storage and counter space.

The main drawback occurs if, as in this example, you have a door at each end of the space (or even more doors in the sides!). A door at each end makes the galley into a through traffic route. How much of a problem that is depends on your family and what's at each end of the kitchen. Sometimes it's possible to block off one of the doors and use an alternative traffic route, leaving the kitchen to the cook.

Another possible gotcha to watch for is appliance doors opening into each other across the center aisle. If possible, offset your appliances so that the doors can't interfere with each other.

Width of the aisle between counters should be about 4 feet. More will give you more room for traffic, but more walking back and forth: less can be OK if it's a dead-end galley with only one cook, but can feel a bit cramped.