Check out Putting a Bullet in Descriptive Text from Charles Ryan.
It closely matches how I prep descriptive text for my own sessions. And, as you can see in Complex of Zombies, I actually push this philosophy even further: Every aspect of an encounter area is keyed as a clearly titled and easily identifiable “chunk” that allows you to instantly grasp the entirety of even the most complex areas in a single glance.
I’ve been thinking about writing a longer essay of my own on this topic for awhile, and I probably still will at some point. But, in the mean time, check out Ryan’s piece.