I would modify Stroustrup's rule like so:

* For new features, people insist on LOUD explicit syntax.

* For established features [that turned out to be used disproportionately often], people want terse notation.

So, I argue, it's not really people getting used to the feature that allows it to be terser. It's that enough time passes that you figure out what features are used enough that they warrant the terse syntax (like the Rust example he gave).

It's a form of selection bias: there are many other established features that are rarely used and left with a verbose syntax but you don't notice them later because, well, they're rarely used.