My biggest fear about this finale was that Arthur would find out about 10 minutes before dying. I'm glad they were able to get in about 40.

Yeah, me too. Have Arthur actually come to grips with it is so much better than sort of going 'well, I am going to die in thirty seconds, so hey, might as well forgive you'. I really liked Merlin getting to show him his magic, too, and Arthur realizing how much Merlin has been doing over the years.