I thought the first 3 bosses in aLttP were guardians of the pedants put there by the goddesses or whoever hid them. But yes the other 7 are high ranking, highly trusted servants of ganon.
Bongo Bongo has always been the biggest piece of cake. As for what I find difficult that others find easy? Lots of people say the flute playing in spirit tracks is easy, but I find it close to impossible (especially when you have to skip a note).
On my first play through OoT I missed the Forest Temple one, I didn't see it and assumed that you didn't get them from the adult dungeons, went back to look after fire temple.
I agree with willsfairysword, I like hunting for the stuff and gaining the items. To me thats what makes it a zelda game. don't get wrong I like levelling up games, I play skyrim and love it! but to me thats not what zelda is about.
Technically it would have been "that gold coloured game" my friend had (AoL). First one I owned and played was OoT, now played through all of them expect for tWW.