Design patterns are there to help you, not hinder. A small part of being a good developer is knowing when to "break the rules". If MVVM is cumbersome for a task and you have determined the future value isn't worth the effort, then don't use the pattern. For example, as other posters have commented, why would you go through all the overhead to implement a simple about box?
Design patterns were never intended to be dogmatically followed.
