Rather than using this thread as a chance to bash on somebody who thinks addons don't have a purpose you could try educating them.
Does using an addon to filter out level 1 gold spammers and people whole say 'nigger' and 'fag' in trade chat make me play worse in the long run? Does having something to tell me whether or not I need to restock potions without running from the AH to the bank make me 'dependent'? Is it really so terrible to have something to let me check which of 10 toons has the BoA trinket and 2h Axe so that I don't have to log into each and search their bags/bank/equipment slots? Does being able to copy/paste from chat really count as cheating or as being inferior in some way?
There are plenty of good reasons to use addons even if you don't want to radically change the appearance of your UI but maybe that guy hasn't managed to discover any of them yet.