I'll second that. Considering I work at an online development agency and only have 4GB of ram in my work machine, I'd say the author is a bit out of touch. This is most definitely an issue for me.
You have twice as much RAM as the people he was speaking of. I'd say 2GB is pretty low these days, glancing at Dell.com even the $499 entry level laptops are shipping with 4GB.
Wow... My laptop that I do most of my work on is packing 1GB. I guess I have had it for 4? 5? years. Of course, using things like wmii and Emacs help keep my memory usage down, but Firefox is making that harder.