Having a big stack means...

-See more flops for reasonable prices. Now you can limp stuff like QJs in EP, and call a small raise if you choose if the opponent is easy, and/or the calling odds are favorable.

-Limp in LP with any two, with the sole purpose of stealing when the opponents act weak. I usually do this on the button. I will basically never fold a button in a limp pot with a high stack. Having more chips gives you more rights to the button.

-Calling raises in LP with a wider range (including any two sometimes), and playing into weakness, or hitting a hand and stacking someone.

You basically want to get involved more, and put a little pressure on people. Not a lot without a hand. Just a little, mostly in position. Take little stabs. The mistake people make is building big pots, and firing second barrells that don't work.

It's hard to make hands in NL hold-em. The more flops you see, the more hands you make. Having more chips allows you to do this and more. It doesn't however give you a license to be reckless.