Statblocks for dungeon rooms:

  

An example

8. Office of the Chef

Illumination: None

Smell: A hint of corruption.

Hazards: Quiet ones, see paragraphs 1 and 2; pan rack, see paragraph 3

As the PCs enter this room, four Quiet Ones shamble towards them out of the darkness- unless they have already attacked during the fight with the feathered serpent in area 7.

A large writing desk dominates the southern wall. 

Quiet Ones

AC 5[14] HD:1 Move: 8, Attack: Spiked limbs 1d6, Special:  quiet ones project a 10’ sphere of silence

Countless spikes (each identical to the one found in on the floor of area 1) pierce the desiccated, rotting corpses of these shambling undead sasquatch. The shimmering remnants of their defiled souls flicker and flash over their patchy rotten pelts like unholy lightning.

A rack of gold and silver pots and pans lines the entire length of the eastern wall. It is rickety.  If any one attempts to remove a single pot or pan the entire rack will fall across the entire room, inflicting everyone 2d6 damage on everyone within; ST for ½ damage.

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The benefit is the presentation of the salient aspects of the room in an ‘at a glance’ format, which can help to limit missed and/or forgotten details.

Other stats could be added, such as an arbitrary danger scale, or treasure. Furthermore, not all rooms will require the same statblock, each can be tailored for the individual room, presenting only what is deemed necessary by the DM.