Out of mild interest and because it's Friday
When playing a new game, do you go slow and steady, overturning every rock and 100%-ing it the first time, or do you rush through the main story, then come back for the leftovers?
I personally try to complete as much as possible the first time, mostly because time is limited, and I just know I probably wont be back, despite my best intentions. I also lose interest in the game once my main boss is hacked apart... just seems like there is no point to getting stronger
So I do as many side quests as possible, backtrack and explore, then show up for the main boss with BFG 9000 Sword of Doom.
Sometimes i just get halfway and think "Meh, whatever. Chaaaarge!"