Yeah, Esperanto appears exceedingly easy if you already speak a few of the Germanic and Romance languages.
I speak Danish, English, German, Spanish and French (in decreasing order of ability), so I feel exactly the same.
I am not sure, but Esperanto may have some Polish in it somewhere. I can't remember, and for the record, I reset my Esperanto progress at some point to start fresh. I say Esperanto may have Polish in it because Zamenhof was born and raised in Poland (although it was part of the Russian Empire when he was born).