I like this. Some of my projects I'm working on 5-6 branches at once (ADHD) and I'll forget which branch had that "cool new feature" I came up with spur of the moment.

Oh nice.
Although it is not much of a problem for me now, since I get to see the branch name at the start of every prompt and can just scroll up to see the previous branch, it should be pretty useful for when I am not doing that or maybe closed my terminal.