I know that RootsMagic does not have a tree view, I assume that is because it can be difficult to manoeuvre around it and it is easy to get lost. Certainly that is my experience with the Ancestry version. However, I do find it a bit annoying that there is no real Tree type view in RootsMagic. Obviously family and descendant view go some way to make-up for the lack of that feature.
Perhaps for version 9 (i.e. the version after the next major release) the development team might like to examine the principles used in zoompast.com which changes detail as you zoom in and out. Just a thought.