I found today something very cool in Blender and I would like to share it. I think is very good to promote stuff like this in the community, so they become known to more users.
My rant is that something while navigating the viewport in Blender is wrong, somehow the viewport is very naughty and wants to give you pain. An example is that: imagine that you work on your human model, you are in waist area, then you navigate to the hand, this way the viewport get constantly out of focus and hence gives you one extra task all the time to set the focus of it (with period key or alt f in object mode).
So the solution for joyful and painless navigation is to enable “Auto Focus” (User Preferences > Interface > View Manipulation) and you will see totally different behavior, which is exactly what you want.