Good advice - I like it.
My traps suck. One of my worst bodyparts and they've no height to them at all - all I do for them is shrugs and only recently I've started upright rows. I'll concentrate more on squeezing and higher reps as I'm willing to try anything now.
Trust me if do a decent amount of reps.....and squeeze at the top....you should feel it the next day especialy if you do some type of physical labor
Another trick I do to stimulate the traps is drop sets.....I pick a weight where I can do 20 reps, then once I get to failure I quickly grap lighter dumbells where I can do another 20 reps...sometimes I do 3 or 4 drop sets in a row until Im to pumped and my muscle feels like its gonna burst.......and a mabey the last rep I will hold the squeez at the top for as long as I can( 5-10 seconds)
drop sets work for stubborn muscles....like calfs for me. But if you naturaly have a great, strong chest or back....drop sets might just make you prone to injury in my opinion....at least from my experience.