I don't want to discount your experience, but I ran the '06 for a few years before upgrading the struts. Body roll is significantly reduced. Lower CG leads to improved traction. Being closer to the ground means the car "floats" less at speed.
Overall, it feels a lot better. Lowering, on its own, won't make a huge difference, but, in combination with better swaybars, struts, etc., I think it does. (That said, I don't have any hard data on this. It's just my impression of the car before & after.)
Blue-ish 2006 2.4, Werks stage 1 turbo, Borla cat-back, DDM braces, Spec aluminum flywheel, Spec stage 2 clutch, Werks aluminum radiator, some gauges, RKSport hood, Morimoto FX-Rs, GReddy Profec, Norm's fenders
'07 GXP, Werks Big Wheel K04 and tune, Solo catless downpipe, TCE Wilwood 6 piston front brakes, 4-piston rears , stainless brake lines, slotted/drilled rotors, BC Racing BR coilovers, Performance Autowerks intercooler, DDMWorks CAI, charge pipes and braces, RPM rollbar