Did you know ….
.. there is another "hidden" camera mode for the 3D Layout. I am using this quite often, when I need to travel in a bigger scene (especially as you don't need to hold anything if you want to go straight ahead all the time):
If you hit the 'Y' key during the author mode in the 3d Layout, it gets enabled or disabled. It's like the old-school VRML Walk/Fly modes: move the mouse to the top window border to go forward, move the mouse to the middle of the screen to stop, move the mouse to the bottom of the window to go backwards etc. There is also a little trick if you want a bit more forward-speed: move the mouse to the bottom of the screen and then hit the 'y' to enable the mode.
While being in this mode, you can also look-around with the mouse while holding the left-mouse-button or pan using the right-mouse-button.