Esperanto is fun :)
Please tell me it stays this easy!? I am having so much fun here, it even sounds like a pretty language! I'm just thinking, "All the benefits of sounding like a romance language... Without the difficulty of learning a romance language!!" Yay for Esperanto :D
I think you'll find that it stays pretty easy. There are some tricky aspects, but that's maybe because there are simply some types of thinking which in most any language have difficulties to them.
But you won't have any irregular verbs to memorize. You will be able see what part of speech a word is because of the endings.
And you will be able to use it to communicate effectively with others much faster than with any other foreign language. I've got a wonderful email pal that I write to almost daily and get to speak with someone who knows hardly a lick of English. We've talked about many diverse subjects and made jokes, we've laughed at what the other has written and felt worry when the other was sick. I've gotten to learn about another person's culture and viewpoints, I've been able to see a world beyond the English-speaking one.
The language may not be perfect. But it is easier and effective and sometimes quite beautiful in sound and the tricks and nuances that can be exploited.
It was one of the best decisions I ever made when I began to study it back in 2010.
I can't say much from experience, but it is supposed to stay easy - that's one of its main aims. The biggest potential difficulty is probably the -n ending, but if you're willing to take on a little bit of grammar that shouldn't be a big problem.
About the romance aspect, perhaps unfortunately that does reduce a bit when you get to plurals. Basically you get a lot of -oj and -aj (said like boy and eye) endings on words. Personally I like the effect, it makes the language feel kind of bouncy.