Not even close. Sometimes you can have a large text file where you need to do a find replace with a pattern. For example, in the translation world this can be a common occurrence for translation files (.xliff) or translation memories (.tmx).
There's a reason why this is widely used and it's not because everyone else but you is dumb.
You're discussing a completely different use case from what I said. RegEx can be increidbly useful but it's not always the only/best option.