As another IB student I can concur that I found the Theory of Knowledge class very rewarding. And the things I learnt in that class have probably given more than the stuff I learnt in math or physics class, despite going off to study physics at university and then switching to math.

That being said I also remember being one of the few students who felt the course interesting and worthwhile. Most of the other students saw it as a waste of time and focused mainly on how to get a good enough grade to not affect their overall average while doing the least amount of work possible.