Does instant transportation effect game immersion?

[Neptune]

but people who need to do the final missions lets say are just payin ppl in town to port them and not getting to mor'dona themselves. or people who start in gridania just shout for a port to ul'dah.

People are just short changing themselves. These are presumably the kind of people who don't appreciate the kind of gameplay you do anyway. Unfortunately there's no way to make them appreciate taking their time in the game and really enjoying it. I find that the game offers a good mix between pure enjoyment and something for those of no patience.