I'm generally in a window, but I'd absolutely block a pusher. More often I see people bolt and scarper as far forward as they can get before they're impeded, mostly roll my eyes at that [and overtake them in the terminal]. Most annoying are those who try to block you in your row during deplaning - I generally need to stand in the aisle to grab my stuff, so no I'm not letting six people who happen to have theirs but were further back trap in for the sake of the five seconds I need. You want off quicker, pay to get closer to the front.

And not strictly on topic: every time I'm in the US I'm struck by the contrast between the rush to get aboard and the utterly dawdling pace most proceed to disembark at...!