Yes, it's used A LOT. Guitar player: amateur Guitarist: professional Maybe you just know a lot of amateurs?
It's rare to hear someone say 'drum player'. Drummist isn't in thefreedictionary. Not sure if it's even a word. Still seems peculiar it isn't a word (or it's a very rare term), even though the 'ist' ending is used for many other instruments, such as percussionist.
Since the Kaossilator was mentioned in this thread and the Microkorg in another recently, here are the two in loving embrace. https://www.youtube.com/watch?v=9XfejaeJCVI"]Kaossilator Pro + MicroKORG Improv - YouTube https://www.youtube.com/watch?v=aOLTpTPpRnQ"]Drum&Bass - Microkorg+Kaossilator Pro - YouTube