Human languages are intuitive, share some aspects and we have centuries of knowledge on how to learn them. Programming is still a relatively new activity in comparison and requires a set of knowledge that you don’t already get in your youth like speaking does. I also know basic Greek and I can swear it was easier to learn than coding at a professional level.
You can't compare basic Greek to professional coding, learning Greek well enough to make a living from it (translation/writing/etc) is what you should compare to. Learning basic Greek is definitely harder than basic coding, and a language's difficulty also depends on where you're coming from (Portuguese is going to be much easier for Spaniards than for Greeks).
Stavros, you said it yourself. It depends on the language you already speak. Learning a programming language doesn’t have any starting point whereas a human language has. Regardless of how different the languages, you can still find similarities in sounds, phrase constructions, etc. Learning to code doesn’t have this