One should develop a good visual cue of where the runway intercepts the aircrafts windshield to determine if things might be outside your own limits.
However, I always used the approach speed and angle difference on the DG to Rwy direction out of curiosity.
At 60 kts, a difference of 20degrees was roughly a 20 kt crosswind component (1 kt for every degree) .
At 120 kts, the component is half the angle (1 kt for every 2 degrees).
You don't need it exact but good for a rough guide.
Better to not think of it and just do rather than over thinking and getting worked up or worried about it.