Oh man, if anything, the UI is -BETTER- on PC than it is on X-Box 360.
Browsing through the perk trees is so much easier and simpler. Browsing through the inventory is quick and easy. And maybe most importantly, you have 8 hot keys instead of 2, which allows for quicker access to spells and weapons and less pauses into the favorites menu.
After experiencing both the console and PC versions of the UI, I am convinced that this is by far the best Elder Scrolls UI yet, and it is so incredibly user friendly on the PC.