I agree some things are OTT, like wind computers (not the essential CRP, those things with string) and time calculators. But it would be disorganised bedlam in the HWD household without instrument fridge magnets - I can tell you!
Personally, I like my fancy pants A5 kneeboard. Because of it I have a very simple system for all the documentation (plog, pooleys plates, etc) that I use on a flight and it works for me.
I also have a transair blue bag. I am frankly the type of person who hates hunting round for the right thing and for 'bargains'. If I am at Transair I will get what I need there; a one stop shop.