I'm going to be honest. I think every sentence in this post is provably wrong, and I know this because I actually looked up the intonation patterns of Esperanto and Spanish, compared it to other Romance languages, etc.
However, I want to believe you dislike Esperanto because its words and word roots basically all come from European languages. That is a valid reason to dislike Esperanto, and I don't think you're wrong for disliking Esperanto.
To be fair, many words in Esperanto can be linked to Spanish, such as the word "esperi". However, you could argue "esperi" is influenced by the French verb "espérer" (to hope).
Italian definitely has a stronger influence on the language than Spanish, looking by word roots. However, French actually has an even stronger influence on the language by that metric.
I think the "Spanish" influence you are seeing is primarily from terms which both Spanish and Esperanto borrowed from other languages, especially Latin. It could also be from terms derived from French which you are mistaking for terms derived from Spanish due to the fact they are pronounced with 5 vowels, despite the fact that the relevant words don't actually exist in Spanish.