`git cb` to get the name of the current branch is a useful alias I have set up, I use it multiple times a day. Taking a note about a particular piece of work I'm on, `:r !git cb`. Spiking some idea, `git co -b $(git cb)-spike`. 
For the spike thing, I do it often enough (easy way to cache stuff before a tricky rebase), that I have an alias for that too
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