I've programmed in typeless languages and they are great for small programs - less than 10,000 lines of code and 5 developers (these numbers are somewhat arbitrary, but close enough from discussion). As you get over that number you start to run into issues because fundamentally your word/array of byte/multi-dimensional array of floats/ ... has deeper meaning and when you get it wrong the code might parse and give a result but the result is wrong.

Types give me a language enforced way to track what the data really means. For small programs I don't care, but types are one of the most powerful tricks needed for thousands of developers to work on a program with millions of lines of code.