When I saw the opening post, I thought the vast majority of this forum would be in agreement but I was clearly wrong.
I can understand people leaving early if they have a legitimate reason. An emergency. But to me that does not include simply leaving to "beat the traffic". It's a poor excuse and many people who have this way of thinking will leave early regardless of the match situation and regardless of the score.
Whilst you're beating the traffic, tens of thousands of fellow fans are not. Do they care? Do they fuck. Whilst you're getting an extra hour in bed, tens of thousands of fellow fans are not.
It especially angers the hell out of me to see people leaving when it is a close match; 0-0, 1-0, 0-1, whatever. That is when the team needs us most but you will still get hundreds, maybe thousands leaving because that is what they do. It's not a spur of the moment thought, it is a pre-planned exit.
If you don't intend on staying the full 90 minutes then don't go. If getting home earlier and having a little longer in bed is more important than applauding the team off the pitch then don't go. Give your ticket to someone who will stay till the end because there are plenty out there who cannot get tickets despite wanting them.
I personally don't give a shit if I have to have an hours less sleep before work the next day. I don't care if I have to sit through more traffic than normal; I am not alone. That is part of what being a football fan is all about. When I'm at a game, it is the most important thing in the world to me.
If you're that desperate to avoid the traffic, park further away from the ground. I park 2 miles away. It's free. Takes only a 25 minute walk to get back to my car and then it's only 10 minutes until I'm on the motorway.