I have tried it a few times. It's good if you're new to the game. Otherwise not so much. I found I leveled slower by using it, as it's suggesting to take the longest possible route usually. Basically following roads everytime, when you could take an easy shortcut. Especially if the shortcut involves a bit of fall damage, it's out of question. The "go here" spots don't also update if you take a shortcut, and then the waypoint arrow points to wrong direction. But perhaps it has been updated since then.
4. The varying hum of the bustle of the crowds, or the crowded rowdy bar, at peak hours might be very effective in drowning out any maddening chatter from the demon soul within your DH, likely more effective than even white noise. Tucking away somewhere where the noise can reach you, yet you are out of sight save for the citizen wandering off the beaten path, might allow you to actually get some rest while your inner demon is at least somewhat drowned out. So you may seek out such a place when you are near a need for sleep, after discovering this new coping mechanism, especially if things have been rough internally lately.
26 ADP, 2 Months Before the Fall of the Black Temple: The Dark Portal reopens and the forces of the Aliance and the Horde come through. Highlord Kruul had planned to destroy both forces. Unknown to the Alliance and the Horde, the servants of Illidan attacked Kruul and distracted him long enough for Illidan to kill him, blasting a hole through his chest. Without their leader, the demons fell into disarray and the Alliance and the Horde were able to fight back the remaining demons.
At some point, Zygor was destroyed. Accounts differed as to what the cause of this was and when it happened. According to one account, the planet was destroyed in the war against the Xaranti. (PROSE: The Bodysnatchers) Another account given by the Zygon Broton in the 20th century said his world was destroyed in a "recent catastrophe". (TV: Terror of the Zygons) Another account, given by Elizabeth I who had been posing as a Zygon in 1562, said that the Zygons lost their world when it burned in the first days of the Time War. (TV: The Day of the Doctor)
There are two parts of the quest chain for each continent. The first part involves defeating numerous Master Pet Tamers, and the second requires you to triumph over the Grand Master Tamer. After you've bested the Grand Master Tamer, dailies from each Tamer will unlock for that continent. All the dailies continue to reward experience for your companions, however only the Grand Master daily quest will reward the Sack of Pet Supplies.