I will never again buy a Samsung product after they refused to honour the warranty claim on my dishwasher. It had a legitimate design defect, I alerted them well within the warranty period, and I provided all the appropriate receipts. They just plain ignored my complaint while putting on a contrite facade in every interaction.
The hardest part of the Water Temple is that one of the keys is hidden way better than the others, and if you start opening doors in the wrong direction you will run out of keys without it. Combine that with the clunkiness of swapping to/from the Iron Boots and raising/lowering the water level, and the place quickly grew tedious and frustrating.
The 3DS remake added an extra camera sweep and some decor highlighting the hidden passage where that key is found.