The Supports MFC check box on the ATL Project Wizard was always a temptation to the ATL 3 developer. We generally didn't want the doc/view architecture, or windowing classes, or print preview framework, but we were sometimes willing to pay the price for them for the useful little utility classes, CString being first among them.
Thankfully, Microsoft has heard the ATL developer's pain. As of ATL 7, the classes in Table C.1 are all available for use in both MFC and ATL projects, without having to drag the rest of MFC along with them.
Several new classes also are used in implementation or customization of CString. The CString class itself is now a template, CStringT, that can be parameterized by character type.