I would not be playing GW2 myself if it was not for EotM and SW. SW is avail for f2p but if I understand right all WvW is not. So if I was a f2p'er checking out GW2 for the first time I would have walked and not bought.
So it's a TRIAL not really a f2p.
WvW is unlocked once you have a level 60 character as a free account. The only restrictions on gameplay for the free accounts are a few "must reach this level" restrictions and a lack of Heart of Thorns content.
It truly is F2P. The restrictions that are there are there to prevent abuse, not to restrict play-ability and they revolve almost entirely around trading and chatting. They are unfortunate necessities in this age of bots and spammers.