Eh, the hype around it maybe, but it can be a useful/unique experience for some - at least if you're not the type where it'd be acutely painful, in which case do whatever gets you through the flight/whatever.

Think about modern life - how often do you find yourself in a position where there are no acute demands, no expectations for how you need to spend your time, and you can just sit with your thoughts for a few hours? Unless you consciously carve out some time for that, IMO it's pretty rare. Multihour travel as a flight/train/bus passenger affords that time with no special effort.

I like at least attempting it for a chunk of the trip, if not the whole time - imagination starts running wild in cool ways, which otherwise doesn't happen as often as I'd like it to. Though in fairness, if it's a plane the cabin noise usually puts me to sleep during the attempt.

I'll put it this way - if you're the kind of person that finds the idea of isolation tanks appealing, depending on why you may enjoy raw-dogging flights or other passenger travel. 100% not for everyone though, and that's fine - different strokes and all that.