My control cavities were one of my points of focus in my major redesign stage, not only does the new cavity look much better, as well as having a unique shape to make the rear of the guitar easily identifiable as one of mine, there were more important functional improvements made also.
More distance between the jack and the tone pot, more meat added around the jack area, way more space added in the cavity so I can easily add extra electronics as required.
As far as the "new toys", I've purchased every single one for a reason. The only "new toy" I've purchased over the last couple eyars that doesn't get used is I bought another fret press. I used it once or twice and then remembered why I got rid of my first one. I prefer to hammer the frets in.
Does the CNC take the fun out of it - no. It's just a router. It's not really any different to hand routing things, it's just that you don't have to find as many ways to mount a template on top. You have to find ways to mount the wood to the bench instead. People without CNC forget, it's just a router.
When I first purchased the CNC I had it in my head that I was going to use it to cut all the parts of the guitar to completion, simply glue them together and then I would be ready to fret and paint. In reality, it doesn't work this way at all. I was a bit delusional to think so and now that I do have it up and running, my views have changed considerably. I also had it in my head that the CNC would be working in one room and I'd be working in the next like two jobs getting done at once. WRONG! The CNC needs to be watched, especially with tool changes, the second you turn your back on the thing it's out to get you. Rise of the machines! Judgement day! That sort of thing. When you're watching it, always have a remote handy with the stop button ready to go, as the thing can be unpredictable at times.
I use mine mostly for roughing/waste removal. I still carve the neck by hand, it's just that I use the CNC to get most of the waste off first. I still hand carve the heel of the body and heel of the neck etc, I just use the CNC to remove the majority of the waste. It's handy to have it route pickup cavities etc and drill holes, but to be honest it takes longer than doing it with a hand held router. You still have tear out and router bit breakage issues and all that crap to deal with that you do with a standard router.
The main way CNC has changed my work is it has enabled for inlay work I just wouldn't have bothered with if I was doing it 100% by hand. Still, it is very time consuming.