Question for you who play it so much - what exactly do you do? I mean there are only so many interesting quests, do you roleplay lots and do dungeons over and over again? I can't see how I could play for the crazy amount of hours as some people do without mods at least.
I can't speak for everyone, but I RP. Other than my 1st character none do more than one "new" questline and my 1st generally only does 2. After their questline is done I do alot of exploreing with them. Doing it that way mean's I don't have to worry about "breaking" any quest's and also the character is high enough in lvl to deal with most things.
Help's that I can spend 2 or 3 real hr's reading books in-game and home decorateing.
Plus for instance I just started playing my first "pure" mage and am doing CoW, now my test chracter did most of it, but that was back in November and I had totally forgotten about one of the area's that you go into and the "Badies" in that area. So it was rather cool to me.
Edit: BTW 360 so no mods