I'm sorry, but besides fixing the UI where it impacts the usability of your application, no one is raving about how a redesign makes the application any better.
This brings up a great point: if you examine user's comments on redesigns that didn't really fix things, you'll find that the positive ones are all about how it looks or feels and tend to be vague, while the negative ones will almost all be very specific criticisms about precisely which part of their workflows got broken. In any other context the latter would be treated as bug reports --- very clear ones at that --- to be investigated and fixed; but it seems a lot of designers are inclined to simply "close"/ignore them all as "they don't like/understand what I did, maybe they just hate me."