No deaths (that is, game overs) in either normal or hero; and yet, I make no claim that the game was 'too easy'. Guess mine isn't the typical mindset - by which I mean the 'this game didn't kill me over and over so it's too easy' one. :-)
Anyway, I'm a very cautious type of player. I always try very hard for no game overs, even on a first time playing through a game. (For that reason, Spirit Tracks can suck it. So many OHKO opportunities; I got my first game over in the first phase - on the train, of course - of the final battle. Wasn't that swell...) So I always carry as much help as I can - potions, fairies, etc. Hence, normal mode didn't give me a whole lot of trouble. Hero mode, on the other hand, was extremely tenuous and stressful. Especially the beginning parts of the game, when I only had 3 hearts, no bottles, and every single enemy did 2 hearts damage - nearly daredevil mode. I think a fairy had to revive me once; the rest of the time, I used plenty of potions to keep me going. Had numerous close calls - again, mostly early in the game. But yeah, if hero mode couldn't satiate the appetite of extreme-difficulty-seekers, then...it's safe to say the Zelda series won't ever successfully do so. 'Cause it was more than difficult enough, IMO.
"Why is it so hard? ... Why can't you just take me? ... I don't have much to go... before... I fade completely..." - Kelly Clarkson
Only played normal so far. No deaths unless you count the max'd out shadow link I fought back before I even got the bow. I think that really added to my experience, I got to see how strong I could become, and it became a goal to work for, the shadow link shot beams at me and then ultimately just did a great spin to destroy me.
"pkmn X focused on the online, making it easier to trade and battle. but this will never work unless they remove this horrible metagaming." - immadbro