You need to have tools to solve problems. Geometry is like using a toolbox. You need to know what tools are in your box and how to use each one of them. Geometry is like using a toolbox effectively. You need to know what you're trying to accomplish, and you need to know which tools will get the job done.
Geometry is like maintaining a toolbox.
Geometry is like being responsible for a toolbox. Use it or lose it. Use it properly or else the tools inside will come back to bite you through improper application. In some sense, nothing is ever next to anything else. But of course that's true only if you can count them.