Welcome back to P99.
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P99 is in a far more complete and era accurate state than it ever has been. You should be pleasantly surprised.
EC tunnel has several dozens of people during low pop and over 100 people during prime time. You'll always find people trading and hanging out there.
Clerics and Rogues are always in demand. I'd dispute shamans being In Demand now-a-days. As the class's population on the server is higher than ever. Monks also also always in demand for pulling and dps. Warriors and Rangers are in demand for raid tanking via discipline. SK is in demand for trash tanking. Druids aren't in demand and they're the most played class. But porting classes are technically by nature in demand, wiz, drood..
Best of luck. Always feel free to ask questions! Search the forums and the wiki too!