In those situations, it would have been much more readable to have classFoo vs foo, foo() vs nonThreadSafeFoo(), etc.
The bigger point is that while you can come up with creative ways to take advantage of case-sensitivity, it's not that you would have missed it if the language was case-insensitive. From that point of view, case-sensitivity has no benefit, but only a cost: leads to irritating errors from the compiler, or runtime errors in dynamically typed languages.
If something has no benefit, and only a cost, we should get rid of it.
The bigger point is that while you can come up with creative ways to take advantage of case-sensitivity, it's not that you would have missed it if the language was case-insensitive. From that point of view, case-sensitivity has no benefit, but only a cost: leads to irritating errors from the compiler, or runtime errors in dynamically typed languages.
If something has no benefit, and only a cost, we should get rid of it.