I'm just a casual user today, I used to stress my computers to the limit, but not anymore.
So I most definitely would make very poor use of maxing my RAM.

Back in the day I loaded DVD 's into virtual drives in RAM, to make games load faster.
For some reason the Linux kernel works best with a swap disk, so I had that in RAM too, and of course temporary files.

These things are of course banal although they were extremely efficient back in the day, and this was a thing I learned already back in the 80's where the Amiga made similar things possible.
Today with fast SSD drives I don't feel the need, and to be honest I already have more RAM than I need. And since I don't program anymore either, which I always found interesting to explore the capabilities of new hardware, I have become an "average" user. 😳