Delphi is just dead, something from the past...
I wish! Delphi has been catching up since the 2009 version, although they care more about adding features than properly testing and fixing bugs. You can even do 64 bits, MacOS X and iOS development with the latest version (some of those using FireMonkey, which introduces hardware acceleration and some other things).
What allows languages like Object Pascal (Delphi), .NET (C#, ...) and a few others to be nicely and easily used for RAD, visual design and so on is extended support for type introspection through RTTI. In that area C++ is rather... poor. It's true it always comes with a price in terms of overhead and code bloat, but it allows for rather nice stuff to be more easily created and self contained. There's a big chance C++ will not support such a thing to that extent, so solutions like those provided by wxSmith will have to stay the norm. No matter how hard you try to make your design as good as possible for it, it's never good enough for some.