I gotta admit... sometimes it's nice just to play around WB1.3 compared to 3.1. Sure, 3.1 may be a lot more "productive", but the simplicity of 1.3 and the fact that most everything written for it just_plain_works without the typical config hassles, sure is a nice reprieve at the end of the day.
Oh... the best thing about owning an Amiga back in the day: showing your friends what a stock machine can do... that was always a lot of fun. Sound sampling was a HUGE deal back in the mid-late 80's and the Amiga was excellent at it. The Cinemaware games and stuff like Frontier: Elite 2 really caught the eye of friends that were into their IBM clones.
Today, showing people what an expanded Amiga can do garners even more fascination. Telling people you still use (and never stopped using really) your Amiga for modern or semi-modern things can be fun. Most of my friends "get it" anyway. While they may not have an interest in playing around with legacy hardware (or anything Amiga), they understand it's a hobby for me. ALL are extremely fascinated by the MorphOS system on the big screen though and recognize how efficient and "cool" it is to play around with. When I have company over, we've been having a lot of fun watching YouTube vids, checking out Wikipedia for the impromptu quick fun fact on something, Facebooking and all that sort of nonsense. Adds to the interactive "partying" we've got going down in the basement. I let people fart around with the system, so its fun to hear their thoughts and questions. Anyone can throw their Windoze or Mac on a big screen - but there's always going to be something "special" about running Amiga-like apps and an OS that's "new" to others. We entertain fairly often, so lots of Amiga awareness gets generated around this house.
