While it's true that CNJs don't seem to be getting any instant casts in their grimoire, according to the
Class Reforms Action List, it seems that WHM will.
I could see these abilities allowing instant cast spells that could be used while moving. And while it hasn't been mentioned that this is Yoshi-P's plan, anything could happen between now and 1.21 when the Jobs go live.
I haven't played the games you've mentioned, but out of the MMOs I have played, WoW's combat is the fastest paced. Especially PvP, it all comes down to instant abilities, positioning, line of sight, etc. So, I'll give you that, there are probably other games that are purely twitch. But FFXIV is still not what I consider to be fast-paced combat, even if it is faster than FFXI.