Some use "fuzzy find" on the filename, which is ultra fast too.
I use something even faster IMO: typically I know at least some of the text of the source / test code file I want to go to. So I either use a function of the editor that can "find usage" or... I simply use ripgrep, integrated in my editor, and start typing text I know is in the file I want to visit.
I still use, sometimes, a "file explorer" to find the file to open but it's not the most common.
In a way using a file explorer is "sort": things are arranged in folders/directories. Fuzzy search or finding usages or ripgrep is "search". So, basically:
"search, don't sort"