I do.
I do a bit of XC MTB racing.
Can be nice to know the distance to the next pit stop.
Which gives you speed too whether you want it or not.
(Average) Speed can be helpful if you're trying to make a certain time.
Cadence is helpful to me since I have a tendency to mash instead of spinning, which my knees doesn't appreciate. The CC reminds me when I fall into bad habits.