I don't know how else to put it, but...
The vast majority of people who play WoW on these boards have played, or still play FFXI.
Once again, lets look at the title of this thread, incase you stumbled in here thinking it was something else.
"Should FFXIV take some aspects from MMO(x)?"
You are in the wrong thread to be bitching about people who play WoW, LoTRO, Warhammer, or any other MMO coming in here and discussing what they would like from those games to see in this thread. That is the entire point of this thead. BG Class of August 2009 needs to simmer the fuck down.
Anyway.
There is a huge difference between the way you quest in WoW and FFXI. In FFXI you don't need to complete over a thousand quests to hit max level, in WoW you do. Final Fantasy's quests are mostly optional, and they are not required to level up, where as in WoW they are. I can see the merit of having a QuestHelper type addon for the game, but at the same time, the quests aren't nearly as important as they are in FFXI. At the same time, I'm sure damn near everyone has alt tabbed or looked online for a guide for some sort of quest, CoP mission guides, Dynamis pull information, so how is that any different?
A lot of people think that addons are the devil or something, but in all seriousness they're not much different from what you use in FFXI right now, so seeing them added is something that I don't really see being a bad thing.
Customizable Unit Frame Addons - The one thing I'd like to see in FF14, I hated the way the UI looked in FFXI and I would love to be able to move things around.
Chat Addons - I like the way Linkshell chat worked in FFXI (except for the whole zoning and missing everything that was said for the last 10 seconds) I would like to see that every linkshell you have gives you a certain channel tab in your chat that you can click on to see what's being said there.
Addons like Recount to parse DPS - People parse DPS in FFXI all the time, no difference.
Addons like Quest Helper - No different than having FFXIclopedia and Somepage open and alt-tabbing and looking at how to do quests. Sites like
Erecia's CoP and ToAU Guide I know tons of people used that.
Addons like Equipment Manager - Windower and scripts with your gear in them.
Boss mod addons - If the game is anything like FFXI, I wouldn't expect to need these, but hopefully it's not. The only thing you really needed to watch for in FFXI was like "Oh Khim has his wings up." The fights weren't nearly as complicated as they are in WoW. This could possibly change though with the way FF14 works.
Addons that show your recast time or buff duration - No different than the addons in Windower, or sitting around with your spell/ability list open, except you can actually do other things while you're doing so.
The basic addons people use for WoW are not that different from anything I used in FFXI, so I don't see there really being a problem. Some people want to customize their game experience to something they are comfortable with, not what the game gives you, cause lets face it, with millions of people playing an online game, not everyone is going to be happy with the same UI. You can put restrictions in to what you can and can't change, but different people like different things, so being able to alter the most basic parts of your UI is something that I don't think should be a big problem.