I'm currently playing my third character (everytime one character dies I start another) and this one is a pure mage. I didn't even touch the main quest and went directly to Winterhold to begin the College quest line and it's HUGE. I've been playing for about 13 hours in this char only and I feel like there's still so much to do, plus there are other side quests in the College that I didn't even touch.
When I finish this char I'll probably start another and do the same with the thieves guild, then another char that will join the Companions and who knows what's next. The point is that every time is like a completely new game with different gameplay machanics.
And I've barely scratched the surface of the main quest :bonk:
$60 is a steal for so much content.