Not GP but I use containers a lot. I have 3 profiles: default, work, and (OSS project shared accounts). It helps a lot if you have sites that are only-one-container. For example, I never open Google Analytics in my default or OSS container, so that one can get defaulted to my "work" container. For sites that you need to open in multiple containers frequently, it's a bit more cumbersome, but there's secondary addons that you can use to add hotkeys, just search "container hotkeys" or something and pick what you like.

Then beyond that there's just a lot of "reopen this site in...."

Also sometimes I just leave certain tabs open for days at a time that are in the right containers, so that helps a lot too.