I think the meter/yard square makes so much sense. No more math! "I can move 30 feet; can I reach that guy?" "Well, let's see, 5, 10, 15, 20..."
This becomes: "I can move six yards; can I reach that guy?" "1, 2, 3, 4, 5, 6 - yep, no problem."
I can count by ones much more quickly than I can...