There are only two points in the game at this point that I allow fast travel:
1: If the game crashed and I'm trying to regain lost progress (which I minimize by heavily practicing the old adage: Save early, Save often)
2: If I wish to summon my horse to my location because I chose to walk somewhere (if this is the case, I always put myself right on top of the map marker so I don't actually go anywhere)
Once I get enough progress in the game, however, I will add a third option:
3: Inter-house teleportation grid (I will simulate paying the Mages Guild a sum of money in exchange for the ability to fast travel from one house to another)
Other than that, it's in-game transportation only. I do have the Frostcrag DLC, so I that also opens up a few teleportation options, but my character has yet to acquire the tower. It really does open up a whole new dimension of immersive gameplay if you don't fast travel all the time, glad to see you are enjoying experiencing Cyrodiil like you've never seen her before.