Most of the addons you listed are ones I use, refuse to use, or have another addon doing the same job.
Not a big fan of stuff like QuestHelper and Carbonite, lazy people addons. If I really have no clue where to go for a quest because the description is vague, I'll just minimize WoW and look it up on WoWhead or use the internal quest helper tool Blizzard added (still has a few glitches I noticed)
As for healbot, I use the Xperl raid frame and it highlights people who have debuffs I can cleanse. And again, lazy addon that does work for you.
Adv Trade Skill looks like one worth checking out, I looked at it before, but didn't get it for some reason.
There are a few addons I've seen and have been curious about:
I've seen addons that announce stuff like when Divine Protection or other defensive cooldowns go up and wear off, announces when taunt misses or fails for whatever reason.
The entire game is set up to be played without a single addon, so anything you use, despite how you may try and sell it is an attempt to make your job easier for any numebr of various reasons that if given the George Carlin filter, the answer would always end up at the same answer, laziness.
The only people allowed to call laziness on anyone using any addon should be reserved for those who play with stock UI only, and I'd bet there aren't that many of us, especially anyone who is involved enough in WoW to discuss topics in a forum format.