OK to disconnect ice maker/water dispenser in new refrigerator?
Ones without water dispensers are readily available.  It may be hard to find one without an ice maker.  

You don't need to connect the ice maker (and water dispenser) water line, and lack of water won't hurt anything.  

Ice makers can be shut off by just positioning the ice sensor bar in the up position.  But there may also be a simple way to disconnect it (like an electrical plug), so that it doesn't make noise if the bar accidentally gets lowered (it would make occasional clicking noises when it turns the water valve on and off, and motor whirring when it's time to dump the "ice").  It might even be possible to remove it and free up space, but that would probably require a technician.