Yeah, big pressing can correspond to big time activation of the pecs. Dips and pressing movements should probably be the basis of your chest program, with some isolation work like flys (I like performing flys and "squeezing" the pecs together during the top portion of the exercise for two seconds or so.)
Here is an article with two exercises that will absolutely kill your pec fibers, I love both of them.
http://www.t-mag.com/nation_articles/255chest2.html