I started raiding not long ago and I keep asking the grp which auras you would like me to use and nobody every answers other than twincast. the only short duration buff I get tells to cast is Nights Eternal Darkness. When I ask the other enchanters in the raid, they say they do not use mana ripple aura. When raid dps classes are doing billions of damage in the raid, are Enchanters proc auras not enough of a dps increase for people to care if we use them or not?
Nobody even cares if I use Mana Reproduction, but most grps complain if they don't get a bard. Is it worth casting mana reproduction once the raid starts, because one of our DDs might do more damage than the damage from MR
The short version answer is in raids you want to be running Twincast and MR proc.
The longer version is that there are a few places where you can change them out.
If everyone in the group coordinates a burn at the open of the event, then everyone will be running ITC. ITC is 100% twincast so the aura is not doing anything productive. You can drop it for a short period for spell focus. You MUST switch back though because spell focus isn't going to work on spells with a travel time (you see those mage spells that throw a fire ball? Nada). So if you want to optimize, do spell focus and MR while the entire group coordinates ITC, then drop spell focus and run Twincast.
If your healer dies and is struggling with mana, you can swap one temporarily with mana regen. Probably MR so your healer can still twincast heals. MR is good DPS, but if a DPS dies and loses all their mana, MR isn't doing jack. I very rarely do this, but if the healer has died more than once and is really struggling to recover, I do make the change to help them get going again.
Arcane disjuction, the "tash totem" can be valuable. On events like Stratos, Shei, Biddles, Hazuri, etc, mez resists can create problems that can be worth giving up a little DPS to prevent. Not everyone would agree with that, but if the choice keeps 1 person from dying, then saving their DPS is worth it. Our guild is ENC heavy, so when a tash totem is used, it is done so by the ENC that is in the group that will benefit the least from the MR aura. This is possibly even more true when light on ENC. If you only have 1 ENC on Hazuri, then that ENC should drop MR for the tash totem. Losing that ENC or 1 tank could be devastating costing way way more DPS than MR adds, so tash totem and get the job done. On Hazuri specifically, run Twincast and MR until 40%, and when the last replicant dies, drop MR for Tash totem and get to work.
Also, sidebar but relevant, is remember that we have Echos, which do the same thing as auras, but instead of hugging the ENC, you hug the spot the ENC leaves the echo. On events like High priest, where people have to run away frequently, and the ENC might need to move some to mez, it can be better to drop an Echo at your group, so you can run off and leave your aDPS with them. (Twincast doesn't have an echo, but MR and mana regen do).
As for group content, Learner's aura is nice, but it doesn't work on AA, so if you are leveling, it can be beneficial, but if you are max level, it is never used.