People are posting a lot of maybe more rational reasons, but I think there’s another answer that’s more in line with just being a human. Airports suck, air travel, generally, sucks and the whole process is riddle with both intentional and also just unavoidable misery. Every time a new step in the sequence of unpleasant and boring steps that is air travel nears, we start to anticipate it and get anxious to move on to that next step in the process. It doesn’t make it faster, it likely only makes the misery arguably worse, but some times people just can’t help trying to mentally hasten things even if in reality nothing is hastened at all.