This addon looks through your combat log to see who’s casting healing spells around you; if it detects that a player has cast a healing spell, it puts a big red cross over their nameplate.
Yes. Yes. YES.
I didn't even make it through the entire sentence before I had this downloaded and installed.
I mean... holy cow! There are PvP add-ons?
I honestly have never, ever thought of looking for a PvP specific add-on. I've got a good 14-15 add-ons for questing, dungeons, raids, the auction house, crafting, and general play... but not once have I ever thought, "Oh, hey. Maybe I should go looking for an add-on to solve this problem I'm having in PvP."
No. I'm not bragging about my l33t skillz. I'm confessing that, with regards to PvP, I think that I've been a particularly dull and uninteresting sort of idiot.
PvP add-ons. Wow. It's like... it's like... just, wow.
Read the whole article - it's an interesting discussion of add-ons and the attitudes towards them, done very well (as Cynwise is wont to do).