I've personally always used scrolling on my bar (always at the bottom across all screens) to switch workspaces. It's not a "gesture" as such, but it has the same effect, especially since I can just throw the cursor to the bottom of the screen and always end up over the bar.

The bar I'm currently using (swaybar) used to switch workspaces on every single scroll event, which made it useless with precise trackpads like the one in my laptop, but I got a patch merged to fix that: https://github.com/swaywm/sway/pull/5067