Other than a couple of occasions where things have run slowly, giving me time to kill the process I choose, I've not noticed any benefit.

Picking a random machine, there is 600MB of swap used. "top" shows where about 50MB is used (Hadoop daemons, systemd bits) but I don't know what the rest is. I guess it could backfire, since logind is swapped out, and I might want to log in on the serial console if the machine is very busy.