They seems to be really different though, you don’t “Speak” or write a computer program like you write a text or a poem, it’s a totally different thinking process.

For one, you're using a complex system of communication, where the meaning of each unit meaning changes, depending on context and the agreement between speaker and hearer. The system is used for phatic, performatic, epistemic, deontic statements, plus more; and it's usually tied into utterances and discourse in a higher level. And it's such a mess that would make any spaghetti code look cleaner in comparison.

For the other, you're delivering a set of instructions. It behaves far more like maths over strictly performative statements than like the above. If you say x = 1, then x is 1. And if you ask if x == 1, you'll get a true/false output, not any sort of implicature or "it depends on context".