What MTG accessories actually make Commander nights better?

[NightHollow]

I've been thinking about upgrading my setup for Commander nights, especially since our games tend to get pretty chaotic once everyone has a decent board established.
Between playmats, deck boxes, card sleeves, life counters, and token organizers, there are so many accessories available that it's hard to decide what's actually useful.
I'm particularly interested in accessories that make tracking everything easier without taking up too much table space.
What are some MTG accessories you genuinely couldn't imagine playing without? Are there any that seemed unnecessary at first but turned out to be surprisingly helpful?