Uh… no.
The black belt has reached a somewhat mythical status in the west but in Japan first degree black belt is just seen as another rank, the rank after 1st Kyu (which is often a brown belt) and before 2nd Dan.
As has been said many, many, many times in this thread, that all completely depends on the system, school, organisation, instructor etc… but, in general, no, Shodan is not "just another rank"… at least, not in the way you're thinking. We'll cover that in a bit.
Shodan, the Japanese word for first degree black belt is literally translated as "low man."
What? Where on earth did you get that from? In no way whatsoever does it mean "low man"…that would be gejin… or kajin… and would be written 下人 (literally: low person)… Shodan, on the other hand, literally means "initial level", and is written 初段. Absolutely no connection between the terms at all… I don't even know where to start with describing just how far from the idea of Shodan "low man" would be.
So therefore I don't see why a sensei from Japan would view it as such a big deal, and would make the test for Shodan much harder than the test for 1st Kyu.
Because it can be a big deal… even in Japan… depending on the school itself. In some, it's really not anything to be excited about… you can earn a Shodan in a range of arts by training in them as part of your high school study, for example… but, just as commonly, it's a marked occasion. The reason is that it's representative (in many cases) of the students' moving on to a more in-depth study of the system. At that point, they've proven themselves worthy of gaining entrance to the arts and their teachings… and, before knowing that a student is ready for that, it's quite reasonable to consider that the test (to ascertain their suitability) be a little more than what's been done before.
Before Shodan (or, in more traditional systems, before gaining entrance to anything beyond the basic levels of a Ryu-ha), the student is only focusing on basics… a test to determine if you're suitable to go beyond that has to be fairly substantial.
Everything has reasons. Even if you don't see them.