The musical intro to M.U.L.E. was GREAT. I worked at a computer store at the time and I just had it running all day.
I had the Atari 400 then 800. After losing days of work to unreliable cassette storage, getting a disk drive (the Trak) was momentous. Being able to NAME files was a bonus on merely being able to read and write them reliably.
I still have the whole system, and my Commodore 1702. That thing needs to be re-capped.