When you take complexity out of one part of a natural language, it ends up sneaking back in to another part. English verbs by themselves are easy to conjugate,

When you take complexity out of one part of a natural language, it ends up sneaking back in to another part. English verbs by themselves are easy to conjugate, but English also uses a large number of modal verbs (I did write, he is hacking, we used to travel, she had better shut up) that these other languages lack. So while a native English speaker learning Spanish has to learn a lot of verb conjugations, a native Spanish speaker learning English has to learn a lot of modal verbs, and the special rules for conjugating verb phrases that contain them.