Fwiw, I have a number of bilingual friends who can think in both languages and report that they feel like there's a slight shift in mood / energy / something when they change language. Maybe they are experiencing a mild form of culture shock.

I'm sure that language and culture have not developed in isolation; that there may be some objective way of measuring a language, from which you could determine characteristics of the society in which is it used. I also think that this must apply on an indivual level; that the *words you have at your disposal are not completely distinct from they way you think / feel / etc.

Of course, I have no evidence to support any of that.