Do you mean Ctrl + scroll wheel? I use that feature quite a lot, I like my font size small but it can be difficult to see for other people so being able to quickly scale it up is really useful
I use Ctrl + <number> to switch between different workspaces on Mac, and half of the time I come back to MS web pages or apps (like Teams) the font is either 9000+pt or then -3pt. Outlook takes the cake though, where for whatever reason they decided to support different font "zoom" levels in different parts. And everyone were dreaming of having the inbox menus in 1pt while having email with 1000pt, right?