Now when it comes to more complex applications, I'd stop using the CLI if I had to search the manpages or the internet each time for doing something I already did previously. Since I discovered the Ctrl+R shortcut (for searching your history), it has been much easier. You read the manpage once, maybe you do an internet search, you enter the command and then you can find it back as long as it's still in your bash history (be sure to set HISTSIZE and HISTFILESIZE to correct values). I also have a DOCS.txt file where I put all the rare but useful commands I'm afraid of losing. I don't need to be an expert in ffmpeg's options (... though I sort of am now), I can just look at my history or my DOCS.txt file!