Do all teams really need a Scrum Master?

Been in an interesting situation that got me thinking. My team's Scrum Master just left, and honestly... we haven't crashed and burned like everyone predicted.

Not saying Scrum Masters aren't valuable (please don't come at me with pitchforks!), but maybe the one-size-fits-all approach isn't it? Anyone else experimenting with alternative setups? Or am I just lucky with my current team?