We are currently working on a fairly complex design with walls going in many different directions. To keep walls parallel is a challenge:

Things would be soooo much easier if I just could rotate the view so that the important outside wall is horizontal. So Google, here I come...

And, hey, there is a way! And it is rather simple:

1. Make sure the view is aligned to Project North
2. Disply the Crop Region
3. Select the Crop Region
4. Rotate the Crop Region

Your view will be rotated along with the Crop Region.

Simple but effective, as Revit will now not only align to parallel or perpendicular lines but also to the horizontal and vertical.