I was surprised how much difference this made, though. It's striking -- the grays that were getting shoved up into "white" are a significant range. I can now see the tabs on my Chrome window! Google maps actually shows the roads clearly! There are so many more gradiations! I had no idea!
This probably means that all the highlights in the photo editing I've done in the past several years has been way off, though.
(Also, this did confirm my impression that the default brightness on my new monitor is absurd, though. After taking a room-brightness measurement, the software said basically, "That's bright! Maybe turn down the room lights a bit?" And then it turned out that the monitor should have the brightness dialed down to about 33% to match anyway.)
Crossposted from Dreamwidth (original here), with comments. Comment here or there; comments here will eventually be duplicated to there.