Well, in oblivion, I used it alot of the time as it was easier than trying to drive (and drive is the perfect word here) a horse. You get a little rock jutting out, and the horse fucking stops! But fast-travel doesnt detract from my experience in Oblivion or either fallout games, as I still explore; Fast-travel just allows me to complete quest quicker as it seems most quests in oblivion where basically fetch or "go here and talk to A, than go here and Talk to B, than go back to here and talk to A again".