Same situation. I get it. But not able to relate to it personally. The term I use consistently for it is 'cryptanalysis'. I have done it for some very simple ciphers. But I don't remember using the term 'codebreaking' to describe it. I have also done 'decoding' in some cases. But those didn't have anything to do with ciphers or encryption.

There is a possibility that most people pick up those ideas from their everyday language, while I got mine from formal education (English isn't my first language, though my proficiency in English is higher than for my first language). Either that or I completely forgot those terms at some point in my life and got replaced with the formal terms instead. (It's a slightly puzzling personal peculiarity.)