I quite like knowing that I can use a Crp 5 simply as slide rules defeated me at school. The only reason I bought one was 1 the ground school insisted and 2 some of the high speed flight planning questions I found easier to use this for.
Don't expect it will appear much again except makes wind corrections easy.
My IR flight training is all glass cockpit garmin 1000 and far removed from the Cr5 as you so rightly point out