mslama,
I too fly a lot. But I can't say that I find the safety instruction card terribly helpful - partly because unless you know what it is trying to tell you, you're lost. For example, it shows the 'brace' position without saying what it is or when it's to be adopted.
So although it may be of some help to native language speakers, the safety demonstration is probably more use. Having said that, I was on one flight in the US some years back where FA's accent was so broad I couldn't understand her!