Actually it IS very interesting, there are not that many inanimate objects like crates and barrels that have served various purposes but not actually having a real impact on gameplay comparing to, oh lets say, doors or guns, both things that we have seen plenty and people just don't seem to get enough of them.
Who invented the crates and barrels? Who was the first person to say "you know what, we are going to put a barrel in that corner and block that passage with a crate so our hero has to find and alternative way". And another thing that is so amazing is, they both are very simple geometric shapes, they could very well be cubes and cylinders.