Ive noticed at a certain point while leveling you start to consistently use more abilities than you can fit on the action bar. As you may use all of these abilities quite frequently for strategic fighting its really necessary to know when these abilities are off cooldown. What i propose is to either show all action bars at once and cycle through the active one to show the recast of all abilities.

Another idea i had concerning action bars is to have your macros hovering above the action bar. When i recently set new macros or change sets to a new class it usually takes some time to readjust to the new placement off abilities and i think it would be helpful if it would display the name of the macros i have available to me without me having to hold down my alt or ctrl key so i can decide which key to press more quickly.

I understand having both of these systems would produce an over sized UI, however i think implementing one or the other would be really helpful.