I'm glad that LL is trying to improve the interface and VERY glad that you're asking our input.
I find, though, that the new interface is klunkier than the present one.
The hierarchical view could use some keyboard shortcuts, such as backspace to go to the next higher folder.
And in the breadcrumbs, the very first thing I tried to do was to click on one of the upper-level folders there, but nothing happens.