Not really an 'aha' moment, more of a dawning realisation as I gained experience. When starting out as a developer, I think there is a tendency to see the part

Not really an 'aha' moment, more of a dawning realisation as I gained experience. When starting out as a developer, I think there is a tendency to see the particular language/framework/syntax that you're using being all-important. Over time, and with experience, you realise that the language and syntax are just the "fine detail" of how you solve problems as a software developer: as your understanding deepens, it's as if a kind of abstraction happens in your brain, because you stop thinking so much about the fine details of language and syntax, and start to worry about things like managing complexity and optimising design etc. And at that point, the realisation for me was that I can apply that experience to any language/syntax/framework, which frees me up to pick the best way of solving any particular problem, and to not be stuck in a rut with any particular technology. An added benefit is that a lot of the debate over stuff like "language X is better than Y", or "this code style is correct and that one is wrong" become unimportant, because you're thinking at a level that's not limited by specifics.