You got/you've got

"You've got a nice life" is formal. "You got a nice life" is informal (I wouldn't use it).

When someone said "John's got a good job", it means he has a good job and the status remain true.

John got a good job- Does that mean he had a good job? or the informal speaker wanted to mean "he still has that job"? To me, this is substandard English and I wouldn't use it, even as a non-native.

You may say, I got a job interview yesterday and I think I did well. "Got"

I've got a lot of stuff to do.

In informal speech, the contracted form can be left out:
I got a lot of stuff to do.

...but it's never left out in the third person singular:
He's got a lot of stuff to do.

That happens in American English. I have no idea whether this also applies to any British dialects.

I have a feeling that in some cases, informal usage and substandard usage are disguise of each other.

Kooyeen
I got a lot of stuff to do.

To me, no one with decent English should ever say that. But that's just me.

http://www.lyricsondemand.com/soundtracks/b/byebyebirdielyrics/lotoflivintodolyrics.html

I Got Rhythm
http://en.wikipedia.org/wiki/I_Got_Rhythm

Great tunes!

http://www.lyricsfreak.com/j/james+taylor/youve+got+a+friend_20069226.html

Use "got" is not a good English. Use "have" or "has" instead.