I strongly encourage any Demoman players to learn Sticky Jumping, but not for the reason you think.
We all know Sticky Jumping doesn't get much use in competitive besides using it to close didtance at the start of a Uber. It's main use is rollouts and simple single sticky jumps to get to next point faster. Sticky Jumping is very practical and must-learn for those purposes alone, but there's a type of Sticky Jump that never gets use in real matches: Sticky Pogos.
Sticky Pogos are not practical in real game as they consume large amounts of health, time and require very percise movement. I'm not encouraging for you to use them in real games. I'm encouraging you to learn them to help your DM skills. "How?" You may ask. Sticky Pogos forces you to get comfortable with the arm-time, speed, offset and time between shots of the Sticky Launcher which comes in extremely handy in DM scenarios.
I got much more comfortable and got a better natural feeling for Stickies after trying to learn Sticky Jumping. This was just anecdotal experience by me. This method of getting comfortable with the Sticky Launcher may not work for you. It benefitted me greatly, though.