Like, I have unmedicated ADHD and my entire group are various flavours of ND but our games are nowhere near as baggy, chaotic, and listless as that.
Why? Because the lesson I learned running AD&D as a teenager was that the GM chairs the meeting - You manage the pace, impose a structure, and keep things moving.
Before you get into writing adventures, designing settings, hacking rules, or doing funny voices, you chair the meeting.