While then Uncle Bob clean code movement has a lot of answer for, it is far far better than much of what came before. I've had to work with 60,000 line functions where #ifdefs worked across brace boundaries

    ...
    #ifndef foo
    break;
    case SomeCondition:
       doSomething().
    #endif
       moreCode();
       break;

I'll take the worse uncle Bob can throw at me over that mess.