The new commit dialog is awful.
It gets in the way of seeing your local changes, it blocks the buttons on the left of the VCS view and you have to click a button to bring up the options instead of being able to glance at them and check before you commit.
However, there is an option to not use it and use the normal commit dialog.
This option is fantastic and should be added whenever a new way of doing things is introduced!
(I'm looking at you "Compare branches")