My Breton mage and attronach sorceresses both have over 400 hours, are quite wealthy and semi-retired. As arch-mage/champions of Cyrodil, they still "play around" in dungeons and will attempt to help those they feel really need it. It is difficult to get them to consider doing any quests they consider trivial. My Skyrim character just attained 500 hours of gameplay, and both games are quantified as 81% complete by Xbox 360 achievements. Lately, I have been playing Skyrim, ME3 and Witcher 2 at a very leisurely pace, with a little FO3 on the side.
However, I have yet to tackle the SI in Oblivion. Both of my sorceresses have visited, and browsed around but feel the quests there are beneath their status as wealthy/famous godesses. I am continuing to enjoy the experiences of others, as well as gaining ideas for a new character, who is hungry and eager enough to achieve fame by completing the SI.
I also enjoy the many linkages to Oblivion lore in Skyrim as well as quests like the return to your roots involving Sinderion. I consider this a respite from Oblivion... but, still playing it.