To quote an EU player that sent me a forum PM:
"dead atm

"
*Waits for the predictable he-doesn't-know-where-to-go comment* (You shouldn't need to know where to go. You should just feel like you're in a populated world. Currently, neither server has that.)
I still have access to an EU account, and primetime versus primetime activity:
NA > EU
Whether or not that is temporary, because of a transfer honeymoon effect... That remains to be seen.
Both servers are not what I would consider healthy, though. Just like on EU, I can still go AFK for long periods of time at 4-5 mid to high level spawns and not really worry about being PK'd. There are a number of empty cities, empty hamlets, and long rides without seeing a soul. NA and EU have that in common.