I've also downgraded to the V6 from typically faster vehicles/engines. With that said I'm pleased with the V6 overall, although it lacks real oomph at times. I think they should have geared it better for lower end torque like Nissan does the 4.0L Frontier/Xterra, but I digress.
Adding intakes and everything will only mildly increase power, you'll never get that oomph you're looking for IMO unless you threw on like a turbo/super charger, but those don't exist yet, and then you have to weigh cost vs. just buying the hemi.
I too have found downshifting it is the most effective method of getting her some go, but truth be told, 1st from a stop has almost no go power. My wife's 3.0L V6 Escape with the 6-speed auto has more get up and go than my Jeep.