With the exception of the dishwasher, washing machine and tumble dryer we can wall mount just about your entire kitchen even if you want heavy granite work surfaces. The sink would be mounted as well with the waste pipes running behind the wall. We have completed several wall mounted installations and the comments are all positive. You can sweep under the cabinets and you can introduce lighting to create a floating feeling.
Some of our designs mix and match floor standing and wall mounting. If I were to redo my own kitchen then I would look to mount the fridge and freezer on the wall, with the appliance housings in between (also wall mounted) and light from beneath.
Wall mounted units require a technical knowledge of how to install them and also a supplier who manufactures a furniture system robust enough to last through years of continuous use.