“How are you doing?” also has a meaning, and sometimes is used in “the deeper sense”, i.e. the literal one.

Graag gedaan is also something you say to be polite, not only when it really was your pleasure to do it, so it could qualify as a phatic expression - I don’t think anyone on the other side thinks “oh well, that person surely cares about me: it’s a pleasure doing something for me!”.