I used to use them. Then I was burned by some Very Opinionated managers and coworkers who didn't like seeing new things. It wasn't a hill I was willing to die on; there's more important things to argue about in C++.
They also aren't very consistent between C derived languages. Mostly because C# inherited its versions from VisualBasic, where And is a bitwise operator instead of a short circuiting one.
I didn't mean to imply that they were new features to the language. I meant to imply that they were new style of coding to the manager & coworkers.
Some other features that have burned me from managers & coworkers is `using` to change the visibility of parent class members & functions and CRTP.