I had access to an a1000 when they where 1st released, so the graphics at the time where mind blowing. Managed to talk mum into buying me an amiga finally when the a500 was released and while games where a big part of my use I'd had an interest in both graphics and games programming prior to the amiga so things like deluxe paint, brilliance, amos/amos pro blitz basic, imagine3d and so on all ended up getting used just as heavily as games. After a while I started to get addicted to AmigaOS 3.x itself, heavily customising my desktop with new gfx and various enhancements from aminet. These days things havent changed a lot. My main interest is in doing creative things and I hope to finally one day finish an original game rather than just doing ports. I understand there's no real money to be made from it, but I've always been interested to see what sort of results could be achieved with a moderately upgraded aga machine, as apart from game styles unsuited to the amigas custom chipset (fps and other 3d games) I dont think anyone really tried (yeah, there where a few heavy aga games, but no games that are written to the amigas strengths that showcase an expaded aga system)..... anyway, I have delusions of one day trying a few genres that showcase aga, this is one of the reasons I stick around,... its like an untapped mystery of the amiga that hasnt really been explored in certain ways yet. (and yes I understand aga is "obsolete" and whatnot, but it's also fun for my interests).
Besides this retro side of the coin though I just think amiga os (and its variants) just have something that's hard to let go of once youre used to it. Despite some of the obvious advantages of win/mac/lin I find I miss the responsiveness of aros (my ng "amiga" system of choice), and knowing every inch my OS and being in control of it, plus a bunch of other things. Theyre only small things, but make it hard to leave (although I wouldnt anyway, I very much enjoy my amiga hobby)