As per Grits's suggestion; a thread to list our ESO "Add-Ons!
On my game:
First and foremost is my favorite: "Idle Animations" - it takes every idle animation available in game and plays them randomly when your character is idling. It is fully customizable so you can shut down ones you don't like.
(example: the other day Calia suddenly just threw up while meeting Buffy for the first time! Nerves? Maybe, but her ability to puke has been shut off now,

)
If left standing idle too long they will yawn, stretch, tap their feet, cross their arms, face palm, etc. Misa signals passing players and points up to the ceiling looking up as if there is something up there, lol. If you take too much time she will droop her arms out like a sulking teenager whose parent is making them wait too long, it is hilarious! And it is totally random, you never know what they are going to do next!
The other day on completing a quest she cheered and leaned her head back and laughed - really AWESOME Add-On!!!
2. Skyshards = speaks for itself. It puts an Icon on your map to make the finding of Skyshards easier. When one is found, it disappears from the map so you have an active data of how many skyshards left in each region (and where they are) to plan out your skill point spending.
3. Lorebooks = Same thing as Skyshards; but it is the Mages Guild Lorebooks. Makes it a hell of a lot easier to find thousands of tiny books in a huge realm! Once each book is found, all indicators to other world copies of that book disappear from your map so as not to keep it cluttered up.
4. Destinations - Helps me keep track of where available achievements; active quest stages; etc - on your map and compass. Once again, they disappear when you find each, and this is also fully customizable so you can check to see where stuff is at any time and then shut them back off to keep your map clean; or just put up certain ones.
Example: It shows the set places on the map that M'aiq spawns for your "I like M'aiq" Achievement; or where to find the Undaunted in a Province just in case you want to buy them a drink, etc. Or you can shut those off and just keep your active quest markers up.
5. Lost Treasures = Shows me a big giant red X on my map if I find a treasure map = where I'll find that treasure. It also puts one up for finding your Survey sites if you do Writs (I do Writs). Without this, every time you raise your crafting materials level you have to search a new Province for where their Surveys are. (which is why I never raised my girl's level in mats till she was at the top of the field and didn't have to do Writs anymore. If they had this add-on when she first started I may have done things differently.
6. LUI Memory Manager = manages the memory usage for Add-Ons so they don't interfere with your gameplay if they are hoggish memory users like this next add-on is:
7 & 8: Master Merchant & The Awesome Guild Store = I keep ahead of Misa's shopping expeditions by selling at the Guild Stores. Master Merchant & TAGS automatically keeps me informed of current market prices for items to sell; keeps a record of my sales and net profits; and helps me manage the store shelves at the Guild Stores I deal with.
Master Merchant has to be a memory hog to keep up with billions of sales; all your mercantile history; all your store inventories (I have five stores I sell at); etc. It is, and so it needs the LUI help above. (I'm pretty sure the Idle Animations uses a good amount as well because it has to check if your character is idle; so = scripts running in background)
I use a mod manager called "Minion" that is Awesome = quick, easy to use, keeps all the add-ons up to date automatically; but I have that feature shut off and once per week I check for updates manually. It takes less than minutes even if some need updated; and this way it is not running in the background of anything else I am doing.
What mods I wish they had:
1. More options to customize the Khajiit like the Ohmes-Raht; Cathay-Raht; etc.
2. Sitting on benches out in the world; an animation to get into a bed and sleep instead of the positioning we have to use now.
3. Player house (I know, this is coming next year)
4. More leisure wear for our characters or the ability to craft it at the clothiers.