Bard is full of timers. Wind+Venom Bite, keeping straight shot up, pairing barrage with a buff, keeping flaming arrow on CD, keeping other buffs on cd. That's all timers mixed with a bloodletter proc. Even with the proc, bards still know what button they're going to push well b4hand b/c they pay attention to timers/cds on top of having played it so long (at a high level) that they can "feel" when it's time to restart whatever it is they need to restart. Just with a weaved bloodletter in between. It's not that different from other classes imo.