I've got into Skyrim only this year, because I'm taking a break from Morrowind, and play exclusively as a Vigilant/Witchhunter.
First time I played, I killed a dragon in Whiterun and when I realized how everyone is calling me Dragonborn and how OP I am, after literally one hour of playing, I restarted and decided to never again play main quest.
I hate sneaky archer thief characters, something that everyone seems to be playing. Never finished any guild quest. Only started College and got bored of it.
I don't use any graphic mods, except HD textures. Other than that - interesting NPCs, all possible Vigilant mods, immersive creature/armour, NPC AI overhaul, Follower tweak and mods that allow me to prolong Dawnguard recruitment and other quests.
I just roleplay as a Vigilant, patrol the Skyrim and do things they do. Robed steel plate mods adds nice Vigilance enchanted armour. Master restoration/alteration, use flames to burn down heretics, smash them with maces and then pray to Stendarr. Great RP experience.
Tried Frostfall and got so anoyed by it. My nord would freeze around Windhelm in 10-15 minutes, even with clothes on and my whole game was about warming up by fire from place A to place B. Would be immersive only if other NPCs wouldn't walk around me half naked. It just breaks the immersion.