I'm in 115 down near the front and I mostly stay til the end and let the stadium quietly filter out around me, but on midweek games I tend to leave on 87-90 minutes.
If the games finishes at approx 9.45pm on a "school night" and I leave 3 minutes from the end I can get home by 1030pm if I'm not getting a lift. If I stay to the very end which is approximately 6-7 minutes later I get home for 1130pm due to the congestion getting out of the stadium, then no 216 buses, so I walk into town and catch the Metrolink from Piccadilly Gdns to St.Retford.
When I used to sit in the family stand I'd sometimes leave on 87mins to get on the tram - again the difference was a 10minute wait if I left on 87mins or a 50 minute wait if I left on the whistle. For those on other sides of the ground they have to leave even earlier to miss that rush. Most of the time, if I left on the final whistle I would just walk to town as it was less boring and was actually quicker than waiting in the Metorlink queue with a bunch of moaning so and so's.
It's a fact of life that just waiting those extra 7 minutes causes an hour of extra journey time - and I only live 4-5 miles away!
So, I guess the moral of my comment is - better transport planning is needed!
1. Have more buses ready - not just the 6-7 they have at the moment - after all, each bus only carries about 80 people so they are only shifting 5-600 people in total. By the time most "stayers" leave the ground all the buses are gone.
2. Get the trams stacked up at the Velodrome - each double tram can safely carry 400 people (more like 500 on a matchday) if they had 5-6 double trams stacked up on the Velo-Droylsden part of the line, coming in at 2-3 minute intervals, they could shift the initial 3000 punters in 12-18 minutes and be coordinated to start as soon as the final whistle blows. These trams could all be set to run to Cornbrook - allowing people to change at Piccadilly, Gardens, Gmex and Cornbrook for all other line.
3. Car parking - I shall let others dwell on that :)
Oh wait - why do I mostly stay to the end? Because I have paid my money, and you would rarely leave a film early unless it was dirge or predictable.