I'd like to play again :)
It will always be so that some areas attract more people than others. On every server there are populated areas and nearly abandoned ones.
Personally I play on Piken Square (EU) and Tarnished Coast (NA). Both have enough people for me, except at 6 a.m. on Sunday morning. For some off reason it is quiet then…
Most low-level areas have the occasional player (bar Queensdale), while middle-level zones usually are deserted. End-game areas will always have people.
This is based off my world (NA Eredon Terrace) and others I have guested too. Maybe some high population server like Blackgate will have more. Also do not join a WvW based server, go for PvE as that is what it seems like you prefer