I've descended both ways as well, and I preferred NDG, mostly because I like to walk, and hate to rap. Even with two ropes, I think it took 10 rappels to the very bottom. If raps are comfortable for you, and you are proficient, the raps likely are quicker, although the ctc times of 1 hour or less take the NDG. It helps to be familiar with the area. Thanks for the comment.
I've walked off to the Yosemite Falls trail (9 miles), but it involves 1400' of UPHILL hiking to get to the trail, a long up/down section, and then down the YF Trail, which is tough on the legs IMHO. The hike kicked my butt, and I like hiking. But fun if you have the time/finish early!