I need to sit down and finish this show sometime. I have S1-4 on dvd and caught a smattering of episodes in S5 and 6.
Personal anecdote time (spoilers for the episode 'I Remember You'): so I watched this episode right around the time it came out and was getting heaps of praise. I liked it, I thought it was well-written and added some neat backstory, but it never really grabbed me. This was before I spent two years caring for my grandfather with Alzheimer's (for the purpose of the story let's call him 'Jack'). One evening, as was too often the case, he started fighting with me over...some completely nonsensical thing. Yet in a rare moment of clarity, realized that he was in the wrong, even if he couldn't understand why. He walked off mumbling to himself 'when are you going to get better, Jack? When are you going to get better...?'
Some time later I rewatched 'I Remember You' with that rather poignant memory still fresh in mind. I found that I had a greater appreciation for it as it went on, and when I got to the point in the ep where the Ice King is mournfully wailing 'Why can't anyone help me?!' it was like a knife right through the heart. I genuinely got the sense that whoever wrote that episode had gone through a similar experience themselves.
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Simple questions deserve long-winded answers that no one will bother to read.