So there is no GCD in wow? unresponsive controls and GCD is something anyone can differ between, and since its a known fact that there is some inputlag problems, especially in WF your post is useless.
And the ONLY reason there is a queue for skills is so you can compete DPS wise with ppl that has better connection, this is a proble, in AION, where there is no queue time what so ever, so if you have 300ms to the server and no queue that means that 0.3 seconds after your GCD is done, you can start your next move, in 3 moves you are one second behind.
If there is a queue system, it will execute the command as soon as 0.5seconds before GCD is complete(if that is your setting) and you will do your moves without breaks, making your inputs *** accurate as someone that has good MS.
WOW always had this, from day one it queued the abilities, and it was always responsive, this game is not as responsive, but that is not a design problem, its lag problem, and it will be fixxed.