[protez]

It's one of the best elisps I've planted in the past few weeks. The other one was dired-efap.el, which eases your filename editing in dired buffers.

[norswap]

Except adding arrow shapes to look like Vim (it's genuinely pretty though), I couldn't tell.

[saidajigumi]

The arrow shapes are not a "vim" thing, they're a powerline thing. Especially as an earlier commenter mentions, the powerline core is independent Python code now, usable in other terminal apps like tmux, etc.