Tim923 wrote:
I always thought the angle was much greater before I heard about it
from a pilot. I think I had 30 degrees in mind. Tell me I'm not the
only one.

Unless you're viewing a slope exactly from the side, it will always
appear steeper than it is. Slope = rise / run. If you're watching the
plane land from an angle, your perception of the "run" length could be
drastically reduced, which would make the apparent angle much steeper
than it is. Sometimes a plane can appear to have a glide slope of 30
degrees.