I don't think NV had anywhere near as many great mods as Fallout 3 did.
Lessee what ones I had...
Project Nevada - general overhaul mod that I don't think drastically changes the pace of the game. It changes equipment, UI, and adds some features, all without tweaking things like AI intelligence or gun damage or healing. Some of the mods in this, like scope zoom, are hard to play without.
RH_Ironsights - improves or fixes some of the game's ironsights.
Weapon Mod Kits Expanded - as the name would imply, gives more weapon mod kits, and tweaks with how the game handles them
Fellout - removes that greenish tint in the game. The absolute best mod for its size
Interior Lighting Overhaul - makes insides darker
Electro Cities - makes the Wasteland have streetlamps: suggested with mods that makes nights darker.
Fallout Character Overhaul - all the character faces don't look stuck in the deepest edge of Uncanny Valley
Spice of Life - aesthetic change, makes it so everyone isn't wearing the same exact clothing as everyone else
EVE (Essential Visual Enhancements) - makes every blood spurt, energy impact, disintegration, explosion, and other combat-related events so much cooler