Nowadays apt supports deleting dangling config files with apt purge "~c" so no need to have aptitude for that feature. However, aptitude why <package> is pretty handy, and if you bump into dependency problems aptitude is quite capable of suggesting valid solutions.
Disclaimer: I’ve never used aptitude’s TUI.
Is “a fan” here a person who stands next to your sleeping body in the dark and watches you? In that case I don’t want one.