Well, in defense of the Camera Tool:
1. When setting up an interior perspective, I like to back my virtual tush to the wall to get as much as possible into the view. With the Camera Tool, I can use numeric input to accurately place the Camera very close to the back wall. Maybe it is because I am not proficient at FPS, but I have found the Camera Tool much easier for this than Explore Mode.
2. For Exterior or Interior perspectives I will place background trees to fill in the scene. With the Camera Tool in place, I can draw two lines to extend the view cone (granted not 100% accurate if the Camera and Target are not at the same height) to determine where the vegetation should start and stop (through a window, between the side of the building and the edge of the view cone).
3. For new users, having the camera in plan is easier to visualize what it is looking at than the Perspective Settings dialog box or Explore Mode, which don't have anything visual in the plan for their existence.
Just my 2 cents.
David