why knowing (atleast) two languages and using them both with online dictionaries can manifold enhance communication

it really is quite simple. yet powerful aswell. language is all about relations and connections. now, when i write a thing in my only language, i'm oft not too inclined to look further for synonyms or decors for those phrases, perhaps not even new ones. but a language that is consciously new [discovered] may be much funner to explore and play with. now, when i know two, i have a better chance of coming up with some kind of word to describe a fragment of thought. then when it doesn't fit perfectly already, translating -back and forth even- may multiply the experience of communication and its enjoyment, hopefully [of all parties involved].