I only turn on my Classic Amigas once in a while to make sure they still work (they do).
I would like to set up my A500 with a large HD and WHLOAD to make it a super Retro game machine and hook it up to my 26" TV for my 8-year old son to see what video games used to look like.
I also have WinUAE (AmigaForever2005). I am still amazed at how compatible it is both for WB1.3 as well as 3.1/3.9. It has great custom chip emulation, especially Paula, for my music apps.
The Amiga I use most nowadays is my Amithlon, for surfing, tinkering, writing, networking. I use it at least once a day. It's as fun as my first A1000 nearly 20 years ago.