Spot color.
Just kidding!
Actually, everyone is right about curves giving the most pop. I do pretty much everything in Lightroom that I can, and only take an image into PS for retouching and other localized work - like adding a custom vignette or lightening one area.
I have my main preset in Lightroom set up to set the exposure controls on auto (I never would have thought of using auto, as it doesn't seem to work in any other program for me, but I learned from DJ here to try it, and it works for me - gets the image in the ballpark in the highlights and shadows) and then I use a couple other settings in the preset:
Clarity bumped up to taste, a teeny bit of saturation, some vibrance. Curves is set to medium contrast, and a moderate vignette is added. A little bit of sharpening is added, and some color noise reduction.
After this preset (which I apply on import) I can adjust contrast to taste - if an image needs more pop, I just use the sliders to add some.
The amount of pop an image needs can depend on how it was shot. Raw files start out flat - they have no extra contrast, sharpening, or saturation added to the image. Jpegs have whatever you had your camera set at "baked" into the file. You can back off the contrast and sharpening, and have something similar to a raw file (it'll have a bit more contrast, and it's still not as flexible) or you can add contrast and have something closer to a finished file straight out of camera, but you'll blow highlight and shadow detail in contrasty situations (or if you over- or under-expose).
I hope that helps!
Edited to add: Something that helps the two examples you posted "pop" is the shallow dof.