I guess maybe because I started with computers before there were GUIs that is what felt normal.
For me, probably not. I did use DOS before Windows as a kid, but that was long before really learning to use a shell. Familiarity with DOS simply made me familiar enough with the idea to be unafraid of it.
When I learned to manage files, handle software, etc. I learned to do it with a GUI in Windows. When I started to use Linux, I was vaguely aware of the usefulness of a shell, and took the opportunity to really learn. To this day, I rarely even have a file manager installed, in favor of a shell environment.
I also got my start on pre-GUI computers (a VIC-20, specifically).