Line up one person with the buff and one without and fire steadily, if you're telling me that you don't notice the difference you're crazy.
By the way, you can further that by the following:
1)Medal - Squad Patrol +4% Attack Speed
2)Guild skill +10% Attack Speed
3)Couple Skill +10% Attack Speed
Total of +24% (+25% if it's multiplicative, which I doubt it would be, would get crazy at later levels...)
In other words that's 12 arrows a second, almost 13. Yes, very speedy.
To be honest you notice the difference even in the +4% attack speed, but it's very noticeable with +14%.