The trip itself can be uncomfortable due to traffic, weather, unpleasant people, body needs, many traps lies await in the way itself that makes people prefer to be time efficient.
Although I do understand the sentiment of the trip is a part of what makes a journey, I don't particularly love to get in a bus for 12++ hours while I can use plane/train and cut that time to a quarter or 1 hour ride, and having more time for myself to enjoy the vacation spot. (save for tourist trap or a tight scheduled place)