Umm, right now with 2 macrumors and a Google Docs tab open on Safari, it's running around 2GB RAM on my MacPro. Firefox uses another 500MB, and for some reason Google Drive is sucking up 1.46GB of RAM...
I don't have problems with my RAM, but my colleages with 3 browsers ant 15-25 tabs each. That'd be around 50-75 tabs opened in the background, and then they use other things like Mail, Office, etc... And yeah, that'll eat RAM.
Modern websites and browsers aren't like what we had back in the days, they really take up a lot of RAM to process.
In other news, How the heck do you even live with 2GB of RAM? I mean, even my 2006 White Macbook got upgraded to 4GB. And I did that like back in 2008.
For reference, right now, with Mail, Firefox (2 tabs), Safari (3 tabs), Rubymine, MySQL (900MB), Twitter, Dropbox, Backblaze, and Google drive running. I'm using 14.63GB 7.24 of which is Cached. Even if we take out the cached, that's still pretty close to 8GB, and I'm not doing any crazy FCPX or Photoshop or Flash.