Can't agree either, after putting on the S5 spec peelers(19x9 +33) from the Titanium package wheels(18x8 +43) I noticed a huge difference.
Not a positive one either, you definitely feel the road more, steering wasn't as responsive nor was the steering wheel as easy to manipulate.
Even now I always feel like I'm driving on a flat tire or something, that's probably the best description I can offer.
In my opinion of course, granted I am using 235/35/19s rather than the factory size tire 255/35/19s.
The urge to go back to 18s is pretty strong but I just love the aesthetic of the 19s
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