Your English vocabulary is bound to improve, and your training in the ancient languages will give you the ability to appreciate the history of English words. Latin and Greek are sufficiently different from English to require you to think in a whole new way about language and grammar . Word order really doesn't make that much of a difference to the meaning of a Latin or Greek sentence, for example, which means that the order or words can be used to produce all sorts of rhetorical or poetic effects impossible in English. It's only through knowledge of the originals that you'll be able to read the New Testament , Homer , Julius Caesar , Vergil , Sophocles , Plato , and many other great authors in their own words. The languages aren't easy, but they're not as tough as they're cracked up to be .
Many people are frightened of the Greek alphabet, for example.
But you'll learn it in a hour. We know you are only human, but so were the Greeks and Romans. If you are willing to make the effort, you can learn the languages. To sum up. Yes, Latin and Greek are not easy to learn for English speakers, because they are further removed from English than some more commonly studied languages like Spanish.