We felt lucky to have been able to get in to see this site in Feb 2020. It has been officially closed for quite a while and will continue to remain closed but during the Winter in Tantora festival in Al Ula the site was partially opened for tour visits. This involved registering and paying for a visit either online or in Al Ula where overpriced festival buses would transport you to the main north entrance. The old Al-Hijr railway station (part of its own Hejaz railway TWHS) is restored and being converted into a visitors centre and after a welcome tea and dates, we found ourselves funneled onto a different guided tour bus for a partial trip around the site.
On maps there is a road that makes a full loop of the site. We made 4 stops along the eastern semi-circle ending at the most famous Qasr Al-Farad tomb before returning the way we came. Seeing as how large an area this all is and the need for a vehicle to get around, I wouldn't be surprised if they maintained this type of tour bus set up as the mandatory way to visit in the future to both increase revenue and keep an eye on everyone. It has been many years since my visit to Petra but if memory serves me right, these tombs felt more numerous and spread out but generally smaller. We were told that archaeologists have recently discovered the residential portion of the city in the middle of the loop surrounded by the tombs and our guide pointed to a large fenced off area which had the look of a dig in progress.
The appeal definitely lies in the lack of crowds and good preservation of the site but my independent nature was frustrated by the lack of freedom to explore the other tombs we could see in the distance and generally wander at will.