By the time you get through about 3/4 of the field, the big blind (and eventually the small blind) automatically puts every player in the game, with the exception of maybe 2 or 3, all in.

If you're table is acting faster, you're essentially becoming the big blind, and going all in, more than you have to. When it gets to this point, each hand is pretty much small blind vs. big blind, with everyone else automatically folding.