I agree school is really exceptionally boring, even for very bright or academic kids. Both my children are high achievers and both of them dislike secondary school quite a lot of the time for different reasons. The lessons are very similar and formulaic and there is a huge emphasis on memorizing and rote learning at GCSE, so that there's no interest in learning for learning's sake, just to perform it later. One of mine also hates the social side of school, all the make friends, break friends stuff - they say if they could just go there, do the lessons, not interact, and see friends out of school it would be a lot easier. There's a lot of low level bitching, although bullying is really stamped on these days.
Both of them love learning in their spare time, attending hobby clubs and learning stuff from online videos. It isn't that they dislike learning, but school is quite tedious in multiple ways. I felt the same, I only started to really love learning at A level when following interesting topics where we went into real depth, using real books (instead of 'learning materials') and then again at university.
I also think it is a shame that many 13, 14, 15 year olds don't work any more as this was a great way for them to start bridging the gap between child and adult worlds. I started working on Sundays aged 13 and loved getting my pay packet. Those social and people skills stood me in good stead.
It's not just about whether you are academic or not, I'm sure schools do serve the less academically oriented badly but they are very restrictive places for more academic children as well, who may have the talent to develop more physical skills or work experience or people skills if given the opportunity. Schools here are incredibly exam oriented and this stunts children's ideas about the world and what makes them successful, I see this all the time at university, student who are trained in regurgitating information without it really going through their heads, not really having any idea about where they are headed or what this is all for. It's quite sad and on a bad day I feel guilty about putting my children through the current English state system, on a good day I think I put up with it, they'll survive and hopefully go on to live more interesting lives in the future.