Like for example
Let's say you're dragging a horizontal line across the screen in solid works.. with angle snapping, there's almost no chance, that you'll have to make a y-correction..
However, without angle snapping, the odds of the need for correction increases..
if fact both solidworks and autocad snaps lines to points precisely to prevent you from wasting time on corrections.. so it's like anglesnapping the anglesnapping..
But regardless.. you'd be more efficient drafting with angle snapping on ..
So, even if we say 1 out of 5 draw moves require the correction.. that adds up to alot if what you do is cad....