Two nights ago, I played from about 8:00PM - 11:30PM (PDT) and ran into one other player early on. (We were both killing Undead Gravediggers before going to see Tia Dalma.) But after that,
nada. I only saw a handful of ships on the High Seas, also. Game ran like a charm, though.
Last night, however, was a completely different story. There were players
everywhere and the seas were jam-packed with ships. Lag got really BAD at times (especially out on the water), and the game froze & crashed on me at least three times. (I was crewing the first time it froze & crashed, but was happy to see that we won the ship battle when I re-logged on.

) About 11:30PM, they started sending out announcements that the game would be closing "for maintenance" around midnight.
I hope last night was an anomaly and that it runs smoother in the future. I really like the game so far, but trying to play it between the lag and the crashes is fairly frustrating.