The game hasn't even gone F2P yet and EU queues are
Icewatch FULL - with queues
Blightweald Medium (it's always low)
Bloodiron Medium (it's also almost always low)
Elrar, the Community Manager appeared in Global Chat and got mixed reactions, but mostly positive.
Like F2P or not, people are trying Rift... and a lot of them seem to be doing so.
I expect the F2P date being (glorious) chaos with all the new content coming out + F2P release.
I may even level a new character just to participate in the euphoria of new players running old content. I absolutely love running dungeons and it's been long enough for me now to have forgotten most of the old ones and I'm keen to experience them with fresh players.