It's amazing how many times I saw the Singleton pattern between 2000 - 2012 or so, and in almost every case, it degenerated into a global variable that was used by everything in a component or system.
It would have been more apt to name it the Simpleton pattern, after most of their practitioners.
This stuff started to go away w/ modern DI frameworks. In fact, I don't really see much of the GoF patterns anymore, particularly ones for managing the order of instantiation of objects. Everything in the C# world has been abstracted/libraried/APIed away. But I wouldn't be surprised if GoF patterns are still prevalent in C/C++/SmallTalk code.
It would have been more apt to name it the Simpleton pattern, after most of their practitioners.
This stuff started to go away w/ modern DI frameworks. In fact, I don't really see much of the GoF patterns anymore, particularly ones for managing the order of instantiation of objects. Everything in the C# world has been abstracted/libraried/APIed away. But I wouldn't be surprised if GoF patterns are still prevalent in C/C++/SmallTalk code.