GPS is difficult, because navigation is so much better when you pull up-to-date maps from the internet - old standalone sat nav units go out of date very quickly, as do printed maps. But at the same time, I don't want the companies behind it to have free rein of my location data to spam me with adverts.
The rest of the sensors aren't that useful - the light sensor is a nice convenience to dim the screen, but Apple introduced the concept over 10 years ago and most laptop manufacturers still handle brightness manually, so swiping the control panel down on a phone and sliding for brightness isn't a big deal. The rotation sensor annoys me, especially if I pick up a device while I'm lying in bed, so I have the screen orientation locked. Other sensors like the health-based heart rate sensor on my S5 are neat, but totally optional.
In short, yes, no (mostly) and yes.
How about dedicated GPS receiver connected with bluetooth? I used to carry one, it worked well.
I use the camera all the freaking time. As in, more than I use the phone function. For me, it is one of the more handy functions of the phone. I no longer keep a camera on me at all times.
GPS? Yeah, I kind of rely on it from time to time to find places I've never been before. In addition, I have a very poor sense of direction, made worse by moving to a northern latitude and from a fairly flat place to a mountainous one. I also use it when on vacation.
Things like rotation sensors I would rather have with me. I could probably live without some because I don't realize they are there or how they help.
The camera is nice for quick snapshots of moments, and when someone else's camera has died, it's nice to be able to take over. But all-in-all I don't use the camera that much. GPS: having turn-by-turn directions is nice, but I can read a map and its nice to understand where you're going before just relying on something telling you to "turn left now"...
There are a ton of sensors in phones now-a-days, so I'm not sure which ones are in use to provide some features that I may really like. Therefore, I'd have to see on this one. My initial reaction is that I don't really use many of them, but this may be a false assumption.
One thing i want is a cover for my camera lenses - i hate that cases dont have this by default. Also i could live without the front camera
why no GPS?
Have a point and shoot for decent pictures, my current phone's camera is pants.
Handy as maps are I wonder what privacy I'm giving up using them.
I don't use sensors.
I've actually considered recently getting a dumb phone.
Could a hardware button disabling all sensors be an option?
Certainly