I am using both IntelliJ and Datagrip.
For some tasks, I prefer using Datagrip, especially if it's database heavy. Now, I am coding my PLSQL package in Datagrip but find that the file and code doesn't get recognised as a PLSQL package. I've set the dialect to Oracle and both images are from the same package:
Now, see the same from IntelliJ
In IntelliJ you can collapse, variables get highlighted but not so i Datagrip.
Now I think I had this in datagrip as well, so probably some sort of setting that is off.