I've never studied Esperanto. I think
>>32 makes a lot of sense.
When we learn a language when young, we don't consciously understand the grammar, it is instinctive. The UK school system is dreadful at teaching English grammar, so when I started learning Italian in my free time I also had to learn the very fundamental concepts of describing grammar in any language - tenses/moods/conjugation. Now that I understand these concepts, I feel I could learn any language a lot more easily. I now have a framework that I could apply to a new language and "fill in the blanks" gradually in a structured way.
If learning Esparanto can easily give someone this grammatical understanding then yes that will definitly help them with future language-learning.