I liked it - we went twice. The first time was just before Fantasmic started. It seemed like we had the whole place to ourselves. I miss the old residential street, but it was fun to see old favorites in new places. IMHO, it is organized for better "people flow" through the display. The second time, we went to Fantasmic and then walked over to the Lights after the show ended. It was much more crowded, but it felt less crowded than it did in years past - again, I think the flow though the display is better this new way.
Also, with the lights in the new streets, they seemed more intense/concentrated. The pictures here on the DIS are quite good - they do give you a real flavor of the display.
Hope you enjoy (or did enjoy) them. We sure did!
Best wishes -