The extra wide (collar to collar if possible..different kind of stretch for the traps), middle and close grip (6" apart) have caused some very good improvement for a lot of Bb'ers. Two sets each , 8 to 12 reps,all in the same trap workout. Don't know why people never seem to experiment with different hand spacing/grips on so many standard exercises, like the simple shrug. Could make a exercise you get nothing from into something special for a lot of guy's, just by a simple grip change.
If read shrugs work for you, than great..though some find it a very limiting exercise.
Best trap experience would be power cleans or Hi-pulls, bar none. Thick, full development..no doubt. Good Luck.