Most of my coworkers scoff at using an ADF even in the F-141. However, all the students I've taught who could use an ADF properly rarely had any trouble with VOR or localizer orientation. Conversely, students who had lots of trouble or never used the ADF tended to get lost easier when using the nav systems. I had one student who had a bit of trouble early on, but once he learned the ADF he rarely got turned around. Even though the system is on its way out, it can develop good skills.