Don't you feel like you have wasted enough time doing English grammar at school?

It has been years and hours spent in classrooms learning english grammar which most of the time doesn't make much sense for most of us. Such a large amount of word and grammar structure you've learnt and cannot properly use....
Why? Because you're not actually speaking the language, but only writting it.
Do you feel the same way? What's your opinion on the ways of teaching english at school?