My impression is that inheritance is in many common programming languages the easiest way to share code. Sharing code in another way would require some more thoughts and sometimes code, so the lazy programmer takes inheritance.

Traits as a general concept would be very useful in many programming languages, but only some (like Scala) have proper support for it. In principle a Java interface with default methods (implemented methods) is also something like a trait, but very limited compared to traits in Scala. I have no statistics, but my impression is that inheritance is much less used in Scala, because the language has an easy to use alternative.

Another example is Go, where structs with their associated methods can be embedded, what is exactly composition supported by the language. Since Go doesn't support inheritance, programmers obviously needs to use this approach, so you would never see inheritance in Go programs.

So, my conclusion is that the usage of inheritance depends on what the language supports and how easy it is to use.