In my (limited) experience, it is not that popular, compared to the use of semantics not available elsewhere (is char signed? Can you cast a void* to int and back without data loss? What happens when you right shift a signed int? etc) and to the extreme use of third party libraries (why the #%$! do I need that GUI library in this json parser? Half an hour later: oh, so it is only for these three typedefs, a few macros, and this convenience debugging function), but it surely does happen.

I also think programmers do regret the decision. Unfortunately, that is unlikely to change, as the programmers regretting the decision almost always are not the ones who wrote the software. It is way rarer for a code base to move compilers within a project/team than for a team wanting to incorporate a third party library into their codebase/compiler.