Honestly, I'd wait until July/August when 1.18/1.19 drop; they're supposedly major patches that are going to really change some pretty basic core features of the game. However, the controls are much more responsive than they were in open beta (my last experience with FFXIV). There's still a 1-2 sec delay for some things, due to everything being server-side, but YoshiP said that they're looking to optimize the UI for both PC play, and to hopefully add some client-side stuff to smooth things out. (God I hope that's soon.)

But yeah, I'd chill for another month or so. If you really wanna dive back in, go for it, but you'll be kinda twiddling your thumbs until the big stuff hits.