It varies by sub-area, but artificial intelligence is also my area, and I don't see that dominance anymore, especially in the more interdisciplinary areas (anything that overlaps with HCI, psychology, cognitive science, etc.). I also don't see the stigma anymore among younger researchers; I detect that attitude from older people mostly, and some of the "harder core than thou" people in math-heavy sub-areas, but there's a bigger mix of preferences among people under 35 who work in less math-y areas. I use TeX myself when it's my choice, but I've collaborated on Word papers as well, if I wasn't the primary author/instigator, and it seems common/expected these days. Especially if someone from industry has been the instigator (e.g. on DARPA-contract type research), or if it's interdisciplinary with someone not from CS/math, they've preferred Word.
AAAI, IJCAI, and AAMAS now provide both options, and my informal observation is that more Word papers are being submitted than used to be the case, especially but not exclusively when it comes to authors from industry. CHI recently officially deprecated LaTeX as a supported option, but still provides the old (no longer maintained) stylesheets as a courtesy. Several universities (e.g. Georgia Tech) have also stopped officially supporting LaTeX stylesheets for theses and moved to Word as the only official option, though they do distribute student-edited LaTeX stylesheets as a courtesy. I assume that one's because nobody in the IT department knows how to edit the stylesheets. The unofficial GT thesis stylesheet is a hilarious example of copy/paste cruft, too, with bits taken from 20-year old U. Texas stylesheets and various other places.
These venues have had Word options for well over a decade or more. I recall a higher rate of Word (and HTML!) submissions in Agent97 -- the predecessor of AAMAS -- than I see in AAMAS now. At any rate I think there are few significant changes in LaTeX usage in those conferences.
You're right that the big place where Word shows up in CS is in HCI, software engineering, and interdisciplinary areas. Is it possible that, given your mention of CHI, that you're from these areas and possibly experiencing a sample bias?
In the areas of high performance computing, systems and languages, Latex is still dominant. Every conference I've submitted to has a Word template, but I've never known anyone to use it.
AAAI, IJCAI, and AAMAS now provide both options, and my informal observation is that more Word papers are being submitted than used to be the case, especially but not exclusively when it comes to authors from industry. CHI recently officially deprecated LaTeX as a supported option, but still provides the old (no longer maintained) stylesheets as a courtesy. Several universities (e.g. Georgia Tech) have also stopped officially supporting LaTeX stylesheets for theses and moved to Word as the only official option, though they do distribute student-edited LaTeX stylesheets as a courtesy. I assume that one's because nobody in the IT department knows how to edit the stylesheets. The unofficial GT thesis stylesheet is a hilarious example of copy/paste cruft, too, with bits taken from 20-year old U. Texas stylesheets and various other places.