WHM is definitely not the fastest first job to 18 or 30 (much less 75 here), but good news is that it's almost definitely not time wasted since so many other jobs utilize WHM as a sub (and even ones that don't will still benefit from you getting it to 37 so you can sneak/invis/deodorize/raise/reraise/teleport, or even toss out random cures here and there while doing random junk). If I had to pick a fastest/easiest/most-fun "first-to-30" job of all the starters, it'd probably be WAR (another useful sub for just about any melee job, so also not time wasted):
Get WAR to 18 and unlock subjob, then decide whether you want to continue down the melee path to lv30+ (go level MNK for WAR sub til 30, or meme it up on WAR/WHM and pretend you're a PLD), or take the time now to go back and start leveling BLM/WHM, which generally levels much faster than WHM. Go cast Stone on everything until lv12, go to dunes, then have fun casting spells that will almost always be resisted anyway. Cure occasionally so you feel more useful. Once BLM is 15-18-ish, you can flip back to WHM with a now-much-larger MP pool and a couple other useful spells to boot. Many parties from here on out with have PLs, so you'll likely have plenty of time to get that Enfeebling Magic capped out - might as well have some BLM-based enfeebles while you're at it.
As for chaining cure (assuming skilling up, maybe?), technically you can do up to 6 in a single macro, e.g.:
/ma Cure <me> <wait 6> /ma Cure <me> <wait 6> .. etc 6 times
The 6-second wait should give it plenty of time for the animation to complete and recast timer to be up for the next cast, but you might play with that delay a bit.
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I'd put cool pics of my achievements/items here, if they were anything interesting. How about "I pooped today! \o/"
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