Well, I think you probably got in your head thet it would be 4x as fast as a 1 core. WRONG. Without somebenches to prove problems, I'd say its in your head for sure. Mosta Apps arent optimized for quad so the extra cores arent gonna make those apps any faster, especially t stock speed.
However you should notice a big difference in multitasking like running antivirus scan while doing other things.
Also the stock enabled speedstep does cause a little lag when it throttles up and down. It goes away if you disable speedstep.