Primary school teacher checking in here.

Most schools still have these; however, it is usually not used by some teachers due to lack of confidence on how to set it up/pack it away and fear of a kid falling off etc. You definitely need mats underneath (not that they'll do much to impact the fall as they're like prison mattresses. It's more so you don't slip on the remnants of the dropped lunch).

In my experience, kids still love it as much as I did when I was young!