Havens potion Alert - This addon will automatically select a presetted quickslot when one of player attibutes drop below defined value. It will also show an alert window with selected quickslot item icon and reminder message to press the quickslot key. There are three quickslots that can be defined in the addon setting window together with threshold values (health, magicka and stamina).
Although I kind of like the look of the uncluttered UI by default, here are some good quality of life add-ons that I consider essential for even newer players like myself: