I also adore autumn time.
I like saying "autumn" more than saying "fall." Autumn has a warm sound--the m and n are cosey snuggled up together, so happy. They love cuddling.
Now "fall" is more stiff, rigid and uptight. The two l's look like the naked trees, when all the leaves have fallen off. Not so warm and pleasant.
The ironic thing is that the two vowels are similar. [a] in IPA. Since autumn has a nice neutral schwa [ə], it gets that extra umpf of coolness.