Push is very, very rarely the cause of an interrupt in there. 95% of the time an interrupt is caused by a bash or an instant death, neither of which are stopped by casting in a corner.
Besides that, I assume that corner is used because it is right by entrance allowing for the easiest set up, safe medding, quick CRs, and the use of pullers who need to gate out to clear aggro but still want XP.
I guess you could use a real corner to fight in instead of a corner to lure mobs around, although it seems like that would have the potential to have deaths on pull because of spells going off on the cleric between DB and DA or enchanters being targetted with nukes by mobs that haven't reached the pack yet once stuns have begun or mobs getting bugged into walls.
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