the answers may surprise you.
Personally, I don't use "star grounding"... because it's impossible to implement on a complex PCB.
Note that the pin names, AGND and DGND, refer to what's going on inside the component and do not necessarily imply what one should do with the grounds externally.
For high current digital, partitioning and "moating" will probably be essential. My question now is "when does it become high current?" Is it 300mA, 500mA, 1Amp? The article didn't specify.