I think Lou has brought a level of maturity to the Cubs. They now act like they expect to win, just like the Yankees used to. There are still joyous celebrations like after A-ram's walkoff homer, but on the whole they are acting like pros. Contrast that with the sophomoric antics of the White Sox, typified by quotes from Guillen, Danks, and Pierzinski. Like their fans, their jealousy of all things Cub overrides their focus on playing winning baseball.
It makes quite a difference when adults are in charge.