Those are my two as well.
I play Nickel against everything but 5 WRs and use Over Storm Brave Man almost every play. This puts the Safeties into man coverage. Sounds generic and simple to beat, but the complexity often comes on what I do with those two blitzing LBs. I'll drop them in coverage, stick one of them in man coverage doubling a one of the receivers, blitz one and zone the other and vice versa. Rarely are they in the same spot twice in a row. And then when the other guy is peppering the corner routes (as that is about the only way to consistently find an open man against man coverage) I'll go with a 2-man look and play zone or use the Over Storm Brave Zones that I have available.
I rarely run into a player who forces me into even trying the zones on the back end or forces me into Dime or a base 43. Typically the pressure is quick as I've learned to shift the DL and LBs in order to cause at least one guy to go unblocked half the time. Showing blitz just before the snap also gets the guys walking toward the line and gets them to full speed faster. Really, any movement I can create from the LBs just before the snap gets their momentum going in the right direction just that much quicker. Slanting, shifting, bunching and spreading the DL in conjunction with slanting, shifting, bunching and spreading the LBs works wonders in creating pressure. I've found that bunching the DL and Spreading the LBs works great in run situations and spreading the DL and bunching the LBs is better against the pass. And a lot of combos in between depending on their formation.
I rarely "user" a player. I get much more satisfaction from out-scheming the other player and using my players to my advantage.