Pretty simple, really, there are purists out there who hate the addition of fast travel and there are some who think it's a useful tool. I think it's okay, I use it when I'm just too lazy to go from one place to another by foot, but I do try to explore as much as possible since we're given this massive, open world and it's a bit of a shame to just skip through it.
It is tempting, sometimes, to just skip the journey and go somewhere, but Morrowind had some decent ways of getting around and I think I preferred that as it made the experience a little richer because when you couldn't be teleported to a place, use recall or hop on a silt strider you were forced to walk which meant that you might accidentally run into a side quest or find a nice bit of loot you would've otherwise skipped with fast travel. Plus, sometimes it's just nice to take a stroll and look at the scenery.
However, that's just my opinion it's obviously different for different people. So, what's your opinion?