I don't think most people use oh-my-zsh. It's very popular, and a lot of people use it, but I think most is a stretch.
Either way, it's just a set of plugins and configs so of course you can get it to work on any setup. Just saying that it's not inherent to zsh, and you can probably get similar behavior in most shells with a similar config.
If a directory has multiple words in it I usually do kebab case: i-like-mine-in-a-way-i-can-read-them-properly. Both easier to read and type than pascal case.
For more complex filenames I use a combination of kebab-case and snake_case, where the underscore separates portions of the file name and kebab-case the parts of those portions. E.g.
movie-title_release-date-or-year_technical-specifications.mp4