Without a doubt, I'd say this site is doing well.
It's starting to grow on me as well!!

The fact that it uses .swf files in all their glory and smoothness is amazing
While I love YouTube, it's hard to get my animations at just the right quality and smoothness with very very minimal frame skip.

I used to be meh about the voting system, but now, I love it.
To me, it seems like free promotion the moment you upload something.
My last submission had to have gotten at least 8 or 9 responses, enough to fill a page and start another.
That makes me feel special and heard.

Because of these reasons, I'm going to start animating a WHOLE lot more to get my fill of this site
Congratulations Newgrounds, you've officially caught yourselves a new one!