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Ada (Pascal-inspired) was designed to be a language that's safe against (mediocre) programmers. And it's case-insensitive. Note that Ada is especially made for reliable systems and they really look for error sources. Case sensitivity didn't show up as a problem, so they didn't have to change it in any later version (Ada 2012 now).

In my experience case insensitivity is very rarely a problem. It's convenient once you get used to it.

> Lot's of 'already defined' errors.

That's false, or at least an exaggeration.

I'm not sure that Thompson and Ritchie really did the world a favor with case-sensitive identifiers. I write a fair bit of PL/SQL, and don't mind the narrower range.