WotLK Curse of elements in pve

[mrburns]

So today I've been told that curse of elements does not give +13% spell damage in pve (wotlk)
The guides that I remember reading few years ago all stated that it does. Can anyone clarify this please? Should it give +13% dmg, is it bugged or not?
Please no guesses, post if you're (almost) sure or tested yourself.

[Baelfrog]

Most likely you will have Unholy DK or Boomkin and you wont be needed to use CoE, so dont worry so much! But I can confirm that CoE gives 13% more dmg in PvE!

[taralej]

It should and it does give it. Idk who told you that and why.

And yes, if you have a boomkin on UDK in the raid you'll just use Curse of Doom anyway.

[Heraxion]

Go on a dummy, unequip every single item and have 0 buffs, use Corruption or Curse of Agony on a dummy once and then do the same with CoE up. You should see damage increase.