There were a couple of sites which usage required Java. One of them was some language exchange site (its name I no longer remember) and another was the screencast-o-matic page for making screen recordings. Now about screencast-o-matic, one can download a program for making screen recordings from them and then no longer need to have Java installed on the machine.
One or two of the alternative Office type programs requires the use of Java for certain features to work. Again, I do not any longer remember which of those Office programs these were/or are.
I have NO Java installed on my (those which are really mine) computers, and I miss nothing about Java.