I actually can't think of a tool I use day to day that I wouldn't recognise from 20 years ago even the really good stuff would be obvious in it's intent (intellij etc).

I'm not really sure where I'd be able to improve significantly on day to day tool usage, maybe a shell that doesn't use bash as the language would be nice (I know there are other shells but bash/dash are the defaults on pretty much everything I touch I can get to a command line on).