@beardedcook I thought the same too, but you can get back to regular 2D mode. On the map controls underneath the zoom in and out + and - buttons when you are in 3D mode you will see an extra button labelled 2D to get back into 2D mode.
I agree though that the user interface would be nicer if there was a toggle somewhere instead of one place to switch to 3D mode, and a different place to switch to 2D mode.