So... Classic.

[Shevron]

Hydraxian Warlords is pretty much queue-free round the clock, but the others were having it baaaaaad.

At about 10:00pm, Zandalari Tribe (Medium) was 6,000+ @ 136 mins wait time.

Then poked a full one just out of curiosity - 14,000+ @ over 280 mins wait time.

Apparently today Blizz changed the way population count works (Haggle has the article)

New Realm Population Label System

Originally Posted by Blizzard
(Blue Tracker / Official Forums)

With a hotfix to WoW Classic a few moments ago, we’ve changed how the realm population labels work in order to display realm populations in a more meaningful way.



How it worked before this hotfix

As we explained here, the system previously calculated the population labels by comparing all realms to the most-populated realm. This could result in a very crowded realm (with a lengthy queue) showing up as “Medium”, since it was being compared to the realm that had the highest population and a potentially massive queue.



How population labels work now

This system now measures each realm against a realm’s absolute capacity. Medium indicates a healthy total population on a realm – well in excess of what we considered Full in a 2006 – with room for more players to log-in. You’ll now see a High label if the realm is close to having a queue, and a Full label if the realm currently has a queue.