the tos enterprise has a saucer of 128 meters; my school is about the same lenght,and we don't have orizontall lift, we just walk.
The new Enterprise is much bigger, and you need to travel through several decks to go where you're going. Airports have conveyors for people, why not turbolifts on starships ? You haven't given any reason why they are dumb.
1- the new enterprise sucks
2- turbolift and conveyors are to different things
I think that 2 crossed converoys in the largest saucer deck and mayby one for deck in the enginering section could be more realistic