Chatbox --> idChat
IEF ---> BugSack/BugGrabber
AuctionSync (LoadOnDemand+LoadWith enabled) ?
Bongos, Bongos_Actionbar, Bongos_Options ----> Bartender2
BuffTimers ----> Doppel's BuffTimers
NECB (Can't replace, guild required) ----> HostelBar, screw your guild if they are using it for raids tell them to get BigWigs
EngInventory ----> OneBag
goodinspect ---->SuperInspect, but there is an ace'd one of Goodinpect
KTM (Guild required) ----> really not needed
Nurfed_Tooltip ---> TinyTip
Nurfed-Utility with MH3 embedded.
QuestLevels ----> Minmalist (has extra features)
ShowBid (LoadWith+LoadOnDemand enabled)?
Titan (1.6 version that doesn't lag as the new ones do) FUBAR, Titan outright sucks.
I'll assume you didn't recognise the addons you put a ? next to:
AuctionSync - auctioneer-replacement, with my edits to save memory while not at the AH
EBR - an addon I wrote myself to remind me for buffs
Radar - tells me if any hostile players are near me.
And as for the replacements:
Minimalist - broken. The options for it do not save last I used it.
OneBag - is there an addon that can enable auto-sorting for it?
You're either completely right, or completely freaking totally wrong. (impossible to overemphasize the latter without using obsceneties)
For warriors, rogues, mages, warlocks, hunters, feral druids, KTM thread meters is absolutely mandatory. For other classes; your aggro won't beat out one of the above classes.
KTM is there to tell the off tanks how much aggro they should have. Off tanks need to hold more aggro than all other members of the raid, but not out aggro the maintank. If they don't know how much aggro the rest of the raid has, they won't be able to tell they need to throw a few sunders to stay ahead. If they don't need to generate aggro to over-aggro random_warlock_00, they should use their rage to do damage with MS/BT rather than aggro generating abilities.
Also, the difference between a guild that starts a fight with "Don't attack until 3 sunders have landed" and a guild that starts a fight with "Burn him the hell down" is KTMTM. A non-KTMTM guild guesses, a KTMTM guild knows. The rogues in my guild don't pop feint unless they need to; for them, KTMTM is a 25% buff to energy regeneration.
Also; about EngInventory, OneBag, MrPlow, etc; I use advanced bags plus, although I couldn't recomend it to someone with UI performance issues. It's a beast on memory, but I can't live without it.
Also, if your framerate really drops to shit during a raid, it's probably one addon causing problems. Get one of the mods that lets you enable/disable mods in-game and spend a raid enabling/disabling everything two at a time.
Actually, I stopped using KTM because it was wrong (just among the people running it, mind, I'm not complaining that it couldn't track people not running it) and lead me to perform poorly more often than it was correct and helpful. Probably it has improved since then, but I came to the conclusion after a bit of thought that this is the "too much automation" level for my class.
Since then, I stick with using addons that do things the default UI does, only better. If I had to turn off all of my addons tomorrow, I would still be able to perform just as well as I can today--it just wouldn't be as pretty or convenient. But there's absolutely no information I depend on to do my job in raids or smaller groups that wouldn't be there.
I think you'll find that around here we don't like people that have the mindset that any mod is "required" to play. I agree that good cases can be made for the need of some mods, but in a raid setting about the only mods that are of any real importance are those that help the raid leader organize... basically mods that reply to simple queries like durability and ready checks.
The more advanced a mod is, the less "vital" it is IMO... and yes, I include BigWigs in that.