To me the most important thing about the Amiga is it's community, ie the users.
I have never met a nicer bunch of people than Amiga (or former Amiga) users. I still have very close personal friends from my Amiga days whom I met through running my BBS.
Also the feeling that you had the best machine, no matter what others said, the miggy could do it too and always even better. And I always won the argument! I could drag windows smoothly, I could have high colour pictures, I could play animations etc. etc.