Since nearly all of the links provided have to do with computer technology, or programming and stuff. Well, I found this:
"For the rest of us":
(From the macintosh slogan "The computer for the rest of us") 1. Used to describe a spiffy product whose affordability shames other comparable products, or (more often) used sarcastically to describe spiffy but very overpriced products.
That perhaps, would explain your most of those links that you gave.
However, it could be seen in another way:
. Describes a program with a limited interface, deliberately limited capabilities, non-orthogonality, inability to compose primitives, or any other limitation designed to not "confuse" a naïve user. This places an upper bound on how far that user can go before the program begins to get in the way of the task instead of helping accomplish it.
Thus, "for the rest of us" could also mean that something's been made so that it is easily usable for the rest of the people who aren't up in the skies in programming or knowledge (like me.)