I routinely open a Navigator view and drag it to the same pane as Model Explorer so that I can easily bounce between a model-centric view and a file-based one. This is especially useful for editing marking files or running standalone archetypes by dropping them into the /gen folder. I’ve defined my own perspective called “xtUML Modeling (JRW)” and saved it in my preferences file to accelerate the process of initializing a workspace. But, when helping others I so often see the need for a Navigator view that I’m now wondering whether we should make it part of the default xtUML Modeling perspective.
I haven’t thought about adding a Navigator view, but it sounds like a good idea. In general I always open the resources perspective in every workspace when modelling, to access the files view. The exception to this is when I work with developing the tool itself, when the Java Perspective is used instead.