Imagine pulling as a Bard in ffxi. There is no possible way that you could queue up all the actions required to do that successfully. You can't queue a heal for someone who hasn't been injured yet...you could but do i need to finish this thought? The thing is that most jobs in XIV wont be able to be played like a monk or dragoon in XI, they involve more player input.
See, that's the beauty of it. You need to learn how to use the system, when to use it, what order to queue etc.
For example, as a healer, you won't be queuing heals for attacks that haven't happened, no. But you can do other things, like cast support spells or attack spells. If you know your first heal won't cover the full damage, you can queue another. It allows you to be slightly more proactive.
The point isn't to queue up 20 seconds of a fight. It's to alleviate the load a little so that you can focus on different things. And part of this is learning how to effectively use it.
Finally, just because you queue something doesn't mean it can go off without help. Some spells/attacks will require you to stand still. But the game encourages movement, so you are going to need to be attentive to your queue, or you can potentially lose out on damage from these actions pausing or canceling.