I am a terrible WHM who can't be bothered to level another class to 26 just yet. I've been doing without swiftcast all the while, including through Titan HM and now Ultima HM.

Here's the way I see it: a good group will not need a rez. A swiftcast will give you one more Oh-NO button whether it be for healing, or as largely intended, for a rez. But with a 3m timer, I am not in any hurry to worry about it. Chances are, if your group needs 1 rez, they'll need a few more. Might as well learn how to rez regularly since you will likely be doing that most of the time anyway.

That isn't to say don't get swiftcast. Doing so is completely ridiculous since it's a free perk. But, as a WHM who is still tooooooo lazy to level another class to halfway just for one spell, and who has done Titan HM several times, all the new dungeons, and some of the other new content, don't fret about it just yet. You'll be fine as long as you know what you're doing with your class in general.

But, still, get it as soon as you can be bothered to grind out another class. Especially if you're going to PVP. It is pretty much mandatory for PVP.