Aman Gupta reflects on his journey from using TextMate, whose cmd-T file finder transformed his code browsing experience, to Janus, thanks to the Command-T plugin for vim, and ultimately to reading most new code directly on GitHub. Missing the cmd-T functionality, he decided to integrate a similar feature into GitHub, which allows users to quickly find files by pressing 't' in any repository's file or directory view, thus enhancing the code navigation experience on the platform.