I for one use not just an exotic layout, but a homegrown one. My alphas match the Workman layout, and I use a 12 column, 4 row keyboard (a Planck form OLKB) so

I for one use not just an exotic layout, but a homegrown one. My alphas match the Workman layout, and I use a 12 column, 4 row keyboard (a Planck form OLKB) so that I have plenty of thumb keys. Symbols are kept on a separate layer of keys alongside a numpad, so that they can be grouped by how I use them. Parens, brackets, braces, are all in the two leftmost alpha columns. I keep $, @, and % in a column because I use Perl fairly often. I also keep # and ! together for fun. Now, I'm not saying it's particularly common, but I have a friend with a similarly exotic setup and we use them on a daily basis.