... today's lesson is about prepositions; everybody's favourite little words that get in the middle of everything and cause you lots of trouble, and headaches, and confusion.
I understand it means that the prepositions in question could be used in the middle of phrases and sentences. The question is the use of "get". Is it common to use "get" there? Is it better to say it this way?
... that come in the middle of everything ...
In other words, is it common to use "get" to refer to the position in a sentence?
Note: Ngram Viewer shows the summation of "come" and "comes" is higher than "get".