Why do people who don't use addon's insult those who do?

They telling you they don't use addons because they consider it cheating is indirectly insulting everyone who uses addons because it pretty much accuses them of cheating.

Nevermind the fact that Blizzard themselves implemented the addon-compatibility functionality etc. and after years and hundreds of thousands of addons Blizzard doesn't say anything against them and actually tries to copy the best of them....

Drop the retarted "it's cheating" argument and no one will insult you.

Note, I called the argument retared, and I stand by that, and not the people. They are just wrong. ;)

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I pretty much agree with and use most of the ones Christian mentioned, except Scorchio (I use PowerAuras), LiveDamage (don't really see the need for it), Hit Assist for Casters (didn't know about it, gonna give it a try) and Opie (same as Hit Assist, but I use Fubar_Portals, so probably not gonna use it).

ZomgBuffz has a ZomgPortalz module that is also very awesome. Depending no whether you're alone or in a group/raid you get a really nice transparent HUD view of all ways of teleportation you have. Portals for Mages, Hearthstone for everyone, the Teleport-thingies for Engineers etc.