I agree with you, chrissyh, which to choose? Non English speakers don't have that problem. I got a bit cross with a sister - we were at a relation's wedding in the Czech Republic since he was marrying a Czech girl. My sister kept saying how awful it was that none of us spoke Czech, when so many of the Czech guests spoke English. Even if you did, where on earth would it be useful outside the CR? (if you were actually living there that would of course be a different matter)
As it happens I did study it for a year, as a side subject to Russian at university and they are similar, but by then it had largely disappeared from what passes for my memory these days.
As a family we have a reasonable knowledge of several languages between us, but there are times when none of them is any use.
My elder dd is a linguist and while a student she got lost in a city in Estonia, not too long after it won its freedom from the USSR. She didn't know any Estonian, but thought they'd all understand Russian. Which they did, but the person she first spoke to replied pleasantly enough, in English, 'We don't choose to speak that language here any more.' (!). Understandable in the circs...