Same indication and approach procedures for all straight in approaches, full GPWS glide path alerting, which can be sometimes a nuisance on short final though, and similar sensitivity as for an ILS/GLS approach (angular approach indication). No fiddling around with the altitude window, simply set the missed approach altitude, same as for an ILS/GLS approach, select approach and intercept the approach in an identical fashion.
And all that independent of flight director status.
Yes, one still has to know the system and its limits, but that is nothing new and applies to all systems. To be honest, all 737s with navigation performance scales we operated had IAN activated as well, and IAN was the primary system with LNAV/VNAV as fallback, which was never necessary.