The iTunes update reintroduces a sidebar for quicker navigation, and uses an enhanced Media Picker, making it easier to switch between different media types such as music and movies. Both components can be customized to show only specific items.
Apple has also spent time trying to simplify menus, and make it easier to flip through content by returning Back and Forward buttons to the interface, both for local libraries and Apple’s online stores and services.
Is it better? Yes.
Does it fix the mess that is the iTunes/Apple Music eco-system. Not by a long shot.
Source: Apple releases iTunes 12.4 with redesigned interface, fixes bugs in OS X 10.11.5