I do the same, and it's mostly because I use one type of human communication to both communicate with people and to provide inputs to llms - and I'd rather not have to "mode-switch" between the two, so keeping same style of mannerism is easier to manage as it lets me focus on my requests instead of thinking how to sound more robotic to save tokens.

I had a coworker who occasionally clearly wouldn't mode-switch from LLM to person mode when asking me questions over slack, which was very jarring. They were normally were personable and friendly, so it was obvious when it happened. Grammar and niceties went out the window.

I briefly felt like I was roleplaying an LLM!