Hallo you new arrived pony-woonies, while i was eating and stuff!
If I'm in a fight, which happens a lot in WoW, I want to be able to see the fight, not my UI trying to be an attention whore.
I also have an addon whose sole purpose is to superimpose a pixel-perfect grid over everything so I can line everything up neatly.
But this UI takes a long time to set up. First 10-15 minutes after creating a toon is spent setting their UI up, but a lot of that is just switching addon profiles. It'd take literally hours to set up from scratch. Addon folder has 160 addons (120 if you exclude Blizzard's UI elements), some of them custom-edited (like the realtime stat display; I edited it so it would be all-caps and look nice, i.e. it shows "STR" or "AGI" instead of "Str" and "Agi").
What's up with Steam?