4.5 years on with my S and while I've not always liked all of the changes from one version to the next, I usually saw most of the updates as improvements, or at worst just "different", but I've never been as disappointed as with this update: loss of customization, extra clicks to open the camera, tiny icon at the bottom to get to camera and other apps (drawing my eyes as far from road level as possible - thanks Elon), pulling up the camera "near" the top brings up the music app covering the entire nav window, nav no longer stays at my preferred fixed zoom and orientation when navigating, music layout is a confusing mess, etc.
I see how the current UI works on the horizontal layout of the 3, but IMO it is just a total fail on the S.