I didn't mean to imply that Notch doesn't program directly in Java—just that, like a C programmer writing assembler will write assembler with C conventions (like almost always passing parameters on the stack, etc.), a programmer who knows [any other non-Blub language] writing Java will think of things in terms of higher-order functions, duck-types, etc., then just type it in in a way java understands (many small anonymous classes, wide hierarchies supporting simple interfaces, etc.)

Let me restate the problem another way: there are many more programmers who only know Java, than programmers who only know [other language X]. Single-language programmers usually aren't familiar with very much theory, and don't know any design-pattern-like abstractions, borrowed from intrinsic features of other languages, that they can put in place instead of just writing tedious, repetitive, dorky (er, I mean, "enterprise") code. 90% of Java's libraries are very, erm, "enterprise."