I've found this game is best when you implement your own restrictions on your character and not use every exploit in the book. That being said, I understand that Fast Travel gets where you were going regardless, as fast as possible similar to taxi cabs in GTA IV (I don't have GTA V, waiting for PC Release) but you can't really enjoy the world Bethesda made when you only use it. I have never made a mod before, but if I did I would put carriages outside every village and major hold, so if you wanted to fast travel you at least had to make it to the next town and pay some septims before you could do it. On the other hand, I play on Legendary Difficulty. At the low levels my character is as weak as a flea or gnat. EVERYTHING kills me without doing everything within my power to avoid taking a hit. 1-2 hits from anything higher than a bandit and I'm as good as dead. So traversing the tundra is near impossible until I get my endgame gear and invest more leveling up into health and such. I like having it, yet I also dislike it. By the time I've equipped my endgame armor and enchanted weapons though, even 2 giants and 3 mammoths don't pose much of a problem, particularly when you have 2 dead thralls (I went with Orchendor and Krev the Skinner), Lydia, Thonnir from Morthal, Vigilance the dog and Barbas the dog, and Esbern and Delphine following me every where (It's incredibly foolish to pick a fight with me and my little posse). THe only reason I can see not to do it in that circumstance is the pathing sucks on the dead thralls and they may not show up at the next hold you fast travel to.