Have beers lined up before HT. It just makes sense. Have different lagers in different piles and you can clear the pre half time queue (that starts building at 40mins or so into the game) in minutes.
Express lanes for solely Alcohol could work, but I'm not sold on that. I just think that one queue would be hammered.
But, I think the most important thing is to have actual staff who work at the same bars every week, that are trained! Getting in casual staff who have no idea whats going on just doesn't work, and you can tell they are visibly shocked by how busy it is. Mentioned before on the forum, Chelsea game I saw a young girl behind the bar about 18 with tears in her eyes with stress of people shouting to hurry up, dealing with the queue. How is that for preparing your employees?
Related to that, have staff that have adequate maths skills, or round the prices down to £3.50 a pint (preferably the latter). The amount of times I have to tell the staff how much a round costs.