Having thought about this question for 3 more seconds just now, I will furnish a better, more insightful answer.
This site serves several functions:
1. It enables me to procrastinate and avoid making decisions or being bored.
2. It is a source of psychological strokes -- receiving recognition in the form of "LOL"s or Reputation shoutouts.
3. It it an outlet for my creativity. Not so much in the form of art, but more linguistic.
4. It lets me be a child and have fun.
5. It lets me be parental and argue.
6. It lets me be parental and offer help. (Less so these days.)
7. It is a source of romance, albeit (or especially) fantastic ones.