Inside the cabinet housing the sink.

I have the same answer as motherof3sons. I don't think it's a popular option around here, so I was surprised to see her response :)

We are on a septic and don't use the garbage disposal too much. DH and I agreed that if we hid it in the cabinet, we wouldn't use it as much. The result? We are great composters :)

It's an airswitch in the countertop. The sink is on an island, so no wall.

I have an airswitch which trips me out often because my old system used to be in the cabinet below the sink. I haven't gotten used to pushing the button on the counter. Love the airswitch though.

Love the airswitch, and hadn't heard of them before visiting this forum. Our gc told us that he would be introducing that idea to all his future kitchen customers, he thought it was great. They really are one of those things where you think, "why wasn't it always done this way???" It's not only the convenient location, but being able to reach up with sopping wet hands and flip it on then off as often as needed. Really cool, you won't be sorry. You can still be committed to composting, just as you can be committed to recycling without a built in recycle bin. The airswitch is great whether you use it every day or every third day....

Airswitch! They're much handier and safer than a "regular" switch of any kind.
Easy to reach, even for people w/short arms
Not obvious to children who like to experiment ("What does this switch do?")
Not in the cabinet where children can easily get to it (at least when it's on a wall it's not as easy for a child to reach). "Out of sight, out of mind" doesn't really work with children (at least none that I know!) They're always exploring, opening up cabinets and drawers, etc.
Since there's no connection to an electric current, you can safely use dripping wet hands to operate it
At it's "point of use"
No wet hands opening/closing cabinets and possibly damaging the finish over time
Inconvenience factor mentioned by AKChicago
No need to "find a place" for the switch, especially if your sink is in front of a window.

Is your granite really 0.75cm thick? In general, granite comes in two approx thicknesses...2cm & 3cm. Do you mean 0.75" (2cm is approx equal to 0.79").

Or, is it a granite veneer? If so, isn't a veneer mounted on some sort of subtop supporting it? If so, there should not be any issues w/cracking...at least not caused by using an airswitch.

We had a batch feed disposal for many years which I loved but when the soap dispenser broke after just a few months operation, we replaced it with an airswitch and continuous feed GD. We really like it.

Air switch here too. And I learned about them on this forum. I love it for all the reasons mentioned above, most especially: point of use and the fact that that it's not obvious to those who don't need to know it's there.

Island and peninsula sinks with an air switch at each. Learned about them on this forum. Point of use with wet hands sealed it for me.

Ours is a regular switch on the wall and I would like to change that to an air switch, for sure! It's the first switch and I keep turning it on thinking it's the light. My kids do the same. We haven't lived here long so I'm sure we would get used to it at some point but guests won't have that opportunity.

What’s the best location for the airswitch? To the right or left of the faucet?

Mine was on the side of my less-dominant hand. I could have a sponge or small soap bottle on the right side, and the air switch was on the left, out of my way.

Mine is directly behind the sink on the wall. Not my favorite place but the new apartment came that way

Can you install an air switch on the underside lip of an island so you don’t have the button on the countertop?

They don't make that switch.

Batch feed. No switch at all, and no gunky rubber "sleeve" to clean.

@C I have seen them installed on the face of the sink cabinet, like where a tipout might be (I don't know if there is a technical term for that.) Because the cable needs to go into the cabinet, you wouldn't be able to install it on the bottom of the counter because the cable would still need to come out somewhere. Houzz convinced me to get an airswitch and they are apparently pretty uncommon, my electrician and plumber were both surprised to see one, but I am SO glad I did!

Houzz convinced me to get an airswitch and they are apparently pretty uncommon, my electrician and plumber were both surprised to see one,

@snappity - actually airswitches are now commonplace. They can be bought anywhere, in quite a lot of finishes, and I rarely see disposal wall switches in any kitchen renovations today. This thread is 12 years old, so even 12 years ago, the airswitch was commonly used.

I like a batch feed disposal which has no switch at all. A couple comments on this thread mentioned them, but the batch feed disposal is truly less common.

I should clarify - uncommon *in my area.* There was definitely a conversation about why I didn't need a switch on the wall for the GD with the (professional, been in business a long time) electricians.