Neat terminal, I've been building the same thing in my free time but haven't reached a point where it is complete / stable enough for being my daily driver.

Have you (anyone) actually sticked to the way of working this enables, or is this just a gimmick?

This is my driver since it become usable. I have 140 terminals on 2 workspaces. Grouped by project/task. I know, I'm the author, so I'm biased, but I love working using it.