Question about Bards and buff cooldown usage/practice

[Bardo]

As others have said, it's not optimal to pop them all together because they each have an "animation time", so you will waste several seconds of your first buff by the time you have the last one up. Instead, it's best to activate them in between GCD's any time you can.

I put all my buffs into a single macro which is bound to mouse4 so that I can easily weave them in during the GCD when Bloodletter or Misery's End aren't up; even on trash pulls.

You should be trying to pop them any time you have an empty 1/2 GCD (unless you know there is a burn phase coming up and they won't be back up in time), and a simple macro makes that a lot more manageable.

HOWEVER; If you macro your buffs together to make them easy to manage, you also need to put them individually on another hotbar so that you can not only see the cooldowns at a glance, but also activate a specific one if necessary instead of jamming the macro until the one you want activates.