I agree that it is uncommon and take getting used to, but it does have the advantage of being consistent, and consistency and lack of special cases is a part of simplicity.
I think that the concept of standards is worthy of consideration. While '>' is an operator in scala and other languages, it's also an operator in basic mathematics. And in basic math, we're taught "if x is greater than zero" using the notation of "if x > 0" (parentheses notwithstanding.)
It's only consistent in terms of how clojure presents it, but it's inconsistent with treatment elsewhere. Consistency does go to simplicity, but if it takes some "getting used to", it can't be all that simple.
For example, how would you express the "between?" in infix notation? In Clojure we can use the same function - "(> 1 x 0)".
I do agree that Clojure way takes some getting used to.
Well, engineers using scientific calculators handled polish notation (and reverse polish notation, like 3 4 + for 3 + 4) just fine for half a century or so...