The last time I rode in a brand new e90 335i sport package, I found the ride very nice. But I've become a bit more of an old man since then too
My main observation is that many, many e90 owners who went from the 335i to the M3 commented about how the "sportier" m3 rode better. Now that may have been a comment about the adaptive suspension, the tires, or just the overall suspension being better dialed in.
I daily drive an e39 m5 lowered on dinan springs and probably semi-worn koni struts. For a 4000 pound sedan, handling is exceptional - but ride quality on long highway drives down 202 (like Money2536 intimated) and along the PA turnpike are a bit more tiring. I will say that this suspension setup may be a bit more track oriented than PA-road oriented though, and I may have been better off staying with BMW's superb stock suspension on this vehicle.