Egads, this is my #1 annoyance. although this is a Google thing and not Samsung, per se. HTC Sense however has an option in the browser settings to disable mobile view pages from coming up (doesn't disable WAP capability though so you can still open a wap page manually).
i tried the manual method where you enter that debug command in the address bar and then go into the settings where you can change it from mobile to desktop (and iphone lol) views and other phones the 'desktop' view takes care of it, but i tried it on the Vibrant and then it renders the browser unusable until you reset the browser.
I came to this site to post about this but someone beat me to it. I hope there is a solution out there. I also think its really stupid that these websites think they need to show android phones their mobile views.