Yes, some such songs are album filler, but there are lot of good short ones, too.
Post filler or good one, either is fine, I'm not taking sides in the matter. I avoid controversy, except when it comes to dissing Peppers, Nature's Perfect Food.
Here's Shel Silverstein, who, as the lyrics reveal, had a purpose for writing such a short tune:
https://www.youtube.com/watch?v=OxGX9OeQCCo