I only did enough of the mainquest to trigger the dragons appearance. Otherwise, I'm quite happy just exploring, admiring, killing and looting.
Yea same here. I haven't even gone to see the Greybeards yet, and I'm level 34. I've only been to 3 major towns too, Whiterun, Riften, and the one that is the home base of the Stormcloaks (forget the name right now). I still have a ton to do just in these towns, and I haven't gone and done much with the major quest lines like the thieves guild, mages guild, bard college, stormcloaks/empire questline, companions, dark brotherhood, etc.
I think I'm gonna split the content through two playthroughs. I'm really enjoying my hybrid archer/1h+shield, but I want to play more of a mage or at least battlemage character as well (I've casted only a single spell in this entire playthrough, and that was a fire spell that I needed to cast for one of my quests), and I'm not sure I'll enjoy doing many of the more mundane quests over again. I feel like theres enough content in here to get two characters to level 50+ without repeating anything, which is fucking awesome.
Can't wait for some of the really good mods to start coming out.