A surprising amount of my time playing World of Warcraft isn't plundering its dungeons, trying my loot luck (it's bad) in the raid finder, or collecting transmogs. No, it's spent fiddling about to get the perfect WeakAura ready so I can treat my Outlaw Rogue like a fighting game character doing combos, rather than an MMO character with cooldowns to manage.
In case you're unfamiliar, WeakAuras is an incredibly popular World of Warcraft UI addon that is, typically, used to help players create their own custom UI elements.