Everyone complains about the bad translation and censorship of Final Fantasy II (U), but nobody mentions that it prevents hours of grinding that Final Fantasy IV (J) has (that I've heard of), while still not being a piece of cake like Final Fantasy IV - Easy Type (J). Some people don't like spending hours just to level up. At least personally I found the difficulty of Final Fantasy II (U) just fine, and I didn't do any other playthoughs so I can't really juge.
It's not that much easier, actually. I'm pretty sure that when FFII US was localized, they didn't increase the EXP and GP gains, and I'm fairly certain they didn't reduce the amount of EXP it takes to level up. All they did was remove a plethora of items, commands, and spells, made Remedies easier to get, accelerated Rosa and Rydia's magic learning rates, maybe reduce some command and/or spell charge times, and changed some maps and added the Beginner's Classrooms. And for the curious, Ian Kelley's "Japan to US changes" FAQ on GameFAQs is mostly fables and myths.
- There might not be enemy rows in FFIV Easy Type, but there certainly is in FFII US.
- Palom and Porom may use Twin Magic more quickly, (It took 6 seconds to cast Pyro in Project II, but 16 to cast Little Flare in J2e's FFIV.) but they can still go out of sync.
- Items aren't harder to get in FFIV. Ethers still cost 500,000 GP in FFII US. Just because it's available from the starting town doesn't mean you can actually buy it.
- Bosses are about the same difficulty between versions, maybe a bit easier due to learning spells faster and certain abilities having a shorter charge time. The bosses themselves were, for the most part, kept the same. I think Asura might've used Protect at one point in her battle in FFIV, but doesn't anymore in FFII US.
- Selene Guardians (Moon goddess enemy, you can steal Artemis Arrows from her.) still use Embrace and that skill still turns you to stone as well as heals you. I'm pretty sure none of the enemies or their scripts were touched, aside from maybe removing Asura's ability to cast Protect.
My point is, if you want to be strong enough to face the enemies without fear, you do have to grind a bit even in FFII US. Though, I guess you're kind of right, Bregalad, in that you don't have to grind as much for Rosa or Rydia's spells. (Palom and Porom have the same learning rates.)