I guess that the things that most of people miss are the closer thing, because you spend special time, or happy times or whatever times so that make them more important to you but I think that if you really care about that you can find a way to see them or to remember them. Like people, there are a 100 ways to keep in contact, like computer, Face Book, phone…. Etc.
And the thing that you will not be able to see, in the case that somebody goes away, well you could chat with the person and the tricky thing of “missing” it’s that you only do for a time … after that you just remember that with joy or whatever you do.