The main grammatical core is very loosely Germanic, but the way you pronounce it has been deeply influenced by Celtic languages (for instance the "Th" sound"), making your language far more musical and nice to hear than any other Germanic tongue. And indeed, the vast majority of your vocabulary were foreign borrowings, and ESPECIALLY from the French, since we have culturally colonized you during centuries.
(French is the true language of civilization, after all!)
In modern English there are twice more words that comes from French/Latin than from Germanic roots. So it's ridiculously easy to learn, and this could explain its contemporary success as a lingua franca, way more than the economic influence of English-speaking countries.