Earlier quoted context omitted.
Good point - Silithus ALWAYS had a low population, because it sucked to get to, and sucked even more to level there. The quests are almost all formulaic, (kill 10 ant monsters, etc.) and there are few plots in any of the quests. Once you hit 60 in the original game, there was plenty to do in _any_ other area that made it worth leaving and never coming back. I did some leveling in all the areas that were available at…
Perhaps you only visited after the gate was opened? This zone was very busy on PvP servers, because of the horde v alliance competition to open the gate to AQ first. I thought the AQ raids were quite enjoyable also. When else has a warrior tank needed a frost wand?
Silithus was really only busy for those 6 months between patch 1.9 and 1.11. Well, probably a bit longer than that I guess since original Naxx was such a shitshow. At most 10 months, though.