I have been using Corpse Explosion in arena pvp for a while now, and some of the top players have recently started using that as well. I think many miss the point on how to use it and have probably not even tried it. Therefore I made this tutorial to explain the basic setup.
NOTE: To get the max out of CE you should be using Glyph of the Ghoul as the damage from CE scales with your pet's HP.
I also recommend using the engineering trinket to get high burst damage.
Here are the two macros which I wanted to share:
#showtooltip Corpse Explosion
/cast [nochanneling:Explode] Corpse Explosion
/use Gnomish Lightning Generator
/cast blood tap
The spec I was using: