Returning player, state of PvE?

Last played during the first couple months of launch and game just didn't hold up. Back now and enjoying it enough as a side game between FF14 raid nights. Question being is the PvE endgame scene here healthy enough? Raiding is pretty much all I play MMOs for these days so while I'm enjoying the stories I'd certainly like to dive into that.

In addition, do people ever go back and do older raids for funsies?