I use vim split windows all the time. Instead of tabbing between files I just open another split. Especially if the change is small.

Here’s to of my favourties from my vimrc: <c-w>S to open a full-width, horizontal split topmost and <c-w>V to open a full-height, vertical split rightmost.

" Open splits at top level
map <c-w>V :botright :vertical :split<cr>
map <c-w>S :topleft :split<cr>

This is what it could look like:

Pretty simple. Pretty neat.