it's still a lot to memorize to get started, and as pointed out elsewhere in the thread, if your background is an isolating language like chinese, the entire concept of inflection is going to be an unnecessary obstacle

also, you're only talking about the most surface aspects of learning a language

in general pretty much every natural spoken language is equally difficult to learn, because if it's easier than what an average person can learn in their first five years of life, its speakers will invent new complexities that allow them to communicate more eloquently and efficiently. sometimes those complexities are very obvious like a larger inventory of phonemes (french has a lot of vowels, spanish doesn't), sometimes they're slightly more subtle (larger vocabularies, less regular inflection, phrasal verbs, higher segmental rate), and sometimes they're very subtle indeed (a larger inventory of idiomatic expressions, a greater cultural expectation that you will recognize literary allusions)

but about the same amount of complexity is are always there. conlangs and pidgins can avoid them (until they become native languages, as swahili and indonesian are, and i know someone who was raised speaking esperanto) and written languages aren't constrained by them because they don't rely on native language acquisition mechanisms