There are many players I find blindly swinging their sword in PvP, unaware or disbelieving that there is an attack cool down since 1.9. This makes me really sad, as I see them wonder why they deal so little damage and ragequit, to got to highpixel or mineplex where there is no attack cool down. I think a good way to solve this is to have occasional, disableable tips show up in chat saying something like "Hey! As of 1.9 there is an attack cooldown for melee weapons! You can turn on the indicator in your video settings to help you time your swings!"