What do you think about the new Admin console in 8.x?

I find the new layout cumbersome to use and slow. In the old version, the Admin had 2 dimensions: a navigation tree on the left (Y dimension) and the tabs for each operation (X dimension). This layout made it very easy to navigate between different pages.

The new layout uses only 1 dimension, so the Admin is forced to navigate down to a page and then go back again to do a different thing. This may be OK if you want to administer Zimbra from an iPhone, but it is slow and counterintuitive when you have a regular screen. Morover, administrators normally have the largest screens in town, so the new arrangement makes no sense.

Is there any way to vote for an improvement? or a downgrade to the old interface?

What do you think is better than before?