One thing that surprises me is the level of “aha” moments using the additional apps. Gwenview and Okular have so many power-user-friendly shortcuts that are intuitive. Lot’s of “Oh that’s nice but it would be perfect if…” moments followed by seeing the option in the settings and/or programmable via a shortcut key
My impression
tldr/cheat: Explains most popular arguments using as little words as possible
man: Explains the entire command using a more technical tone
info: Explains the entire command in slightly more informal tone. Can feel wordier as a result, but on the flipside it connects alternative/related commands in a logical way