Some people play
World of Warcraft using
user interface (UI) mods. These
AddOns change how unitframes, actionbars, the chat frame, scrolling combat text and screen fonts are displayed on the screen, usually by making them more streamline and compact. They do away with the clunkiness of the ornamentation that is in the default UI.
However, these addons are usually highly intertwined with the WoW program code, and often stop working as intended when the game client is changed with a content patch. Players usually become very accustomed to playing the game using a narrow set of controls, and become very frustrated when they have to do without their UI mods, spoiling their virgin dungeon or raid experience.
Some other people would rather avoid such disappointment and leave their UI mostly unadulterated. Of course, others may find a joy or challenge in playing the game in the way Blizzard intended them to play it, with an elaborate and ornate UI complementing the vibe of the playing field. For whichever reason people play the game through the Blizzard default UI, there are still ways to make handling the character easier under it.