You will be very well equipped to learn Polish, then, since classical greek has a much more complex system of conjugation than Polish. Polish has mood (2) and aspect (2) as well as 4 tenses (past perfect, simple past, present and future) which makes it simultaneously much simpler than english and more frustrating. They used to have a pluperfect, but it is only used by academics and egg-heads now. The future tense is generally split between the use of the future tense of "to be" and an infinitive or a simple past tense to communicate perfective and imperfective future tense. Otherwise, verbs are very regular with only a few exceptions for spice.

The nouns, on the other hand....oh god, the nouns.

Eitherway, it's a very rewarding language and can be great fun to speak and mess around with. The poles do not appreciate puns very much and will look at you funny if you mess around with their language for fun, which is a shame since it's a lovely language for fucking around with. But occasionally you will meet a pole who thinks the same and the following conversation will be golden.

Look up the poem "Lokomotywa" by Julian Tuwim on youtube for an example of the amazing things you can do with Polish.