I presume you mean there is no suitable API for a GC in C++? It's not an all or nothing proposition really. I choose to make all new classes children of the GC class so that new is automagically GC'd for them. I otherwise don't touch what I use from std and avoid using new with these objects. I also use new (GC) for raw low level array allocation. Works for me so far and is not particularly complicated.
What's complicated actually are the crazy semantics of C++. Once you understand it, it's not so bad, and I'm even starting to enjoy it. However it's quite a bit easier and more productive to program in languages with a built in GC. Compare say, Java, D, or some of the functional languages such as Haskell, Ocaml or even Lisp/Scheme.
Other than D, however these languages underperform computationally and D is not yet mature enough to have good development and debugging tools. Thus C++ is still pretty attractive (especially if I can have a garbage collector too