I have a series of things I do unconsciously while waiting, depending on character I am
Usually it's this, if not this then it's because I know all chats are dead
Open menu, chat, world chat, guild chat, party chat, private chat, close menu, repeat in few seconds
On necro
Bone shield, poison shield, heal, panic
On deathknight
Death call, exhalation, dark shield, steel hurricane
On mage
Dragon eye, stone shatters, overload, chains, sun shield, warp
On ranger
Point shooting, blessing, dodge, apply trap infront of character
On rogue
Poison, stealth, dodge, extermination, unstealth
These are basically what I tend to click in quick succession on whichever character I play as I wait, and I like how it goes. Especially mage as it has so many skills to do