Hey, I realize you posted this almost four years ago but I was looking for threads about APS film and found it.
To answer your question: yes, there are a handful of us. Last year I shot 66 rolls of APS film, and developed all but two of them myself. The two that I sent out were because they were slide film (!). Those were the only two APS slide films I had ever seen let alone shot and I've never done E6 developing myself so I thought sending them out would be best.
It looks like APS isn't very popular here (or anywhere else really lol) but I'd be glad to talk about it if you want. I also started a facebook group a few years ago called
APS Film Users Group that you're more than welcome to join or just look around. Lots of folks there still shooting APS, quite a few of them developing it themselves, and there's even one guy who can reload empty APS cartridges with 35mm film that he cuts down to size.