shilgia, No, I don't think that's to much of a generalization UNLESS perhaps the OP doesn't speak Spanish. Then I would say, "it depends".
I had 4 years of on and off study of Spanish when I met my (future) wife, but I certainly was not at the conversational stage. My wife was just beginning to study English. Since I had so much more vocabulary in Spanish than she did in English, it was easier to converse in Spanish, so even though she has taken English classes now for nearly 7 years, my Spanish did not stagnate and continues to outstrip her English, so when the complex subjects of running a household, an family of 6 and a business are part of the day to day conversation, it's much easier to have error free communication in Spanish, rather than in English.
Also, and this may be unique to México, the English classes taught in the schools here in Sinaloa are not what I would call English as a second language classes, since they concentrate on grammar, grammar and more grammar and give very little instruction in vocabulary and pronunciation.

