Gotta say, I agree with all of these guys, particularly on the squat thing. I know it sounds weird, but it's true. That's why power lifters (who usually stick to the most compound movements, ie. Squats, bench, deadlift etc) have such thick chests.
Here's something you can try, to shake things up a bit with your routine however. Maybe it'll spark some growth.
I've always been a big believer in super sets. Not sure why, but for some reason, but when I super set two movements from opposite body parts, I get great results. Not everyone I've worked out with has, but it sure works for me.
Example, I'll do a set of heavy dumbell curls and then quickly switch to tri-cep rope pull downs. Next thing you know, my arms are like balloons they are so swollen. I'll do several sets like this and then continue my arm work out if I feel it's necessary. Sometimes, it's all I need though.
For you, for chest, I've found that doing wide grip bench press (heavy) in to bent over rows (medium to heavy) makes my chest and upper back swell up with blood. The next few days I can already notice a marked difference and I feel all nice and sore. Might be worth giving a try. Other than that, these guys on here can give you the best advice. They are the experts.