The main menu pattern for large portals

When creating large sites, usually information portals, designers often face the problem of organizing the main menu. The list of sections of the site does not fit in a reasonable horizontal menu of 5-7 items, and, as a rule, covers all or almost all aspects of society.
Recently, the next approach began to meet ...

Thus, by making such a site we get several dozens of “most important” links, which are all equally important and should be accessible to the interested user.
Often, designers have to introduce a certain gradation and break the menu into 2 levels, introduce additional side menus, etc. However, such measures as a rule only worsen the readability of the site.
The following solution seems to me very reasonable, examples are presented below.





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Now we have - several main points, which, when hovering, unfold into a large panel of several hundred pixels in size, on which a “catalog” of topics, sections and various functional links is expanded.

Unfortunately I could not find the first to use it.