[maxlybbert]

Ease of use and discoverability.

For people accustomed to IDEs, the fact that they don't have to remember "n" means "next," "s" means "step into," "info breakpoints" will say which breakpoints you've set, etc. is a big deal. Yes, you can use DDD for that, but frankly, it doesn't look as nice.

Additionally, if you want to see what value a variable has, simply hover over it with the mouse pointer. This works for ints, but it also works for std::vector<std::map<int, std::string> >. You can get the same functionality in GDB, but it takes a little work to set it up.