That was greatly pleasant to read ! I learned english at school and A LOT with videogames (and then english subbed videos) and i just love "olde" english, as you mention "Thou" which is the same as "Tu" in french, second person singular.
But i love old french too, which is almost unreadable, even for french native speakers.
Btw, learning German as my second langage helped me a loooot when i started learning english. And i can understand a very few of italian/spanish because some words are pretty much the same yeah.
I really liked reading your post, i'm sorry that my english is poor, not sure you'll understand (or everyone else haha) what i'm trying to say :)