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If your trapezius is overdeveloped, it may be partly genetic and hard to get rid of. The best thing you can do is to avoid shrugs and other exercises that work the traps. This may be hard to do if you do a lot of overhead reaching or lifting. Another approach is to work the shoulders with lateral raises to make them broader so the traps won't be so obvious. Upright rows just to shoulder level can also make your shoulders stronger so that the traps won't have to work so hard.
Any big moves like deadlifts, straight-leg deadlifts, cleans, etc automatically make my traps go 'boom'! It kinda' sux because those are great moves that I desire to get stronger in... I don't do shrugs or anything that works them directly but it's hard to avoid working them.