I’m willing to bet you’ve just forgotten how to do it well. Running PbtA-ish games has made D&D style games hard. Then I remember running AD&D for years and never prepping a thing, never reading monster entries beyond a few bits I cared about (who the hell uses Move or Morale for monsters?!), and most certainly never making maps ahead of time.

How did I (we?) do it? I bet it’s just familiarity.